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Currently, tracing snapshots are context-free - they capture the ring
buffer contents at the time the tracing_snapshot() function was
invoked, and nothing else. Additionally, they're always taken
unconditionally - the calling code can decide whether or not to take a
snapshot, but the data used to make that decision is kept separately
from the snapshot itself.
This change adds the ability to associate with each trace instance
some user data, along with an 'update' function that can use that data
to determine whether or not to actually take a snapshot. The update
function can then update that data along with any other state (as part
of the data presumably), if warranted.
Because snapshots are 'global' per-instance, only one user can enable
and use a conditional snapshot for any given trace instance. To
enable a conditional snapshot (see details in the function and data
structure comments), the user calls tracing_snapshot_cond_enable().
Similarly, to disable a conditional snapshot and free it up for other
users, tracing_snapshot_cond_disable() should be called.
To actually initiate a conditional snapshot, tracing_snapshot_cond()
should be called. tracing_snapshot_cond() will invoke the update()
callback, allowing the user to decide whether or not to actually take
the snapshot and update the user-defined data associated with the
snapshot. If the callback returns 'true', tracing_snapshot_cond()
will then actually take the snapshot and return.
This scheme allows for flexibility in snapshot implementations - for
example, by implementing slightly different update() callbacks,
snapshots can be taken in situations where the user is only interested
in taking a snapshot when a new maximum in hit versus when a value
changes in any way at all. Future patches will demonstrate both
cases.
Link: http://lkml.kernel.org/r/1bea07828d5fd6864a585f83b1eed47ce097eb45.1550100284.git.tom.zanussi@linux.intel.com
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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The action refactor code allowed actions and handlers to be separated,
but the existing onmax handler and save action code is still not
flexible enough to handle arbitrary coupling. This change generalizes
them and in the process makes additional handlers and actions easier
to implement.
The onmax action can be broken up and thought of as two separate
components - a variable to be tracked (the parameter given to the
onmax($var_to_track) function) and an invisible variable created to
save the ongoing result of doing something with that variable, such as
saving the max value of that variable so far seen.
Separating it out like this and renaming it appropriately allows us to
use the same code for similar tracking functions such as
onchange($var_to_track), which would just track the last value seen
rather than the max seen so far, which is useful in some situations.
Additionally, because different handlers and actions may want to save
and access data differently e.g. save and retrieve tracking values as
local variables vs something more global, save_val() and get_val()
interface functions are introduced and max-specific implementations
are used instead.
The same goes for the code that checks whether a maximum has been hit
- a generic check_val() interface and max-checking implementation is
used instead, which allows future patches to make use of he same code
using their own implemetations of similar functionality.
Link: http://lkml.kernel.org/r/980ea73dd8e3f36db3d646f99652f8fed42b77d4.1550100284.git.tom.zanussi@linux.intel.com
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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Currently, the onmatch action data binds the onmatch action to data
related to synthetic event generation. Since we want to allow the
onmatch handler to potentially invoke a different action, and because
we expect other handlers to generate synthetic events, we need to
separate the data related to these two functions.
Also rename the onmatch data to something more descriptive, and create
and use common action data destroy function.
Link: http://lkml.kernel.org/r/b9abbf9aae69fe3920cdc8ddbcaad544dd258d78.1550100284.git.tom.zanussi@linux.intel.com
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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The hist trigger action code currently implements two essentially
hard-coded pairs of 'actions' - onmax(), which tracks a variable and
saves some event fields when a max is hit, and onmatch(), which is
hard-coded to generate a synthetic event.
These hardcoded pairs (track max/save fields and detect match/generate
synthetic event) should really be decoupled into separate components
that can then be arbitrarily combined. The first component of each
pair (track max/detect match) is called a 'handler' in the new code,
while the second component (save fields/generate synthetic event) is
called an 'action' in this scheme.
This change refactors the action code to reflect this split by adding
two handlers, HANDLER_ONMATCH and HANDLER_ONMAX, along with two
actions, ACTION_SAVE and ACTION_TRACE.
The new code combines them to produce the existing ONMATCH/TRACE and
ONMAX/SAVE functionality, but doesn't implement the other combinations
now possible. Future patches will expand these to further useful
cases, such as ONMAX/TRACE, as well as add additional handlers and
actions such as ONCHANGE and SNAPSHOT.
Also, add abbreviated documentation for handlers and actions to
README.
Link: http://lkml.kernel.org/r/98bfdd48c1b4ff29fc5766442f99f5bc3c34b76b.1550100284.git.tom.zanussi@linux.intel.com
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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Commit d716ff71dd12 ("tracing: Remove taking of trace_types_lock in
pipe files") use the current tracer instead of the copy in
tracing_open_pipe(), but it forget to remove the freeing sentence in
the error path.
There's an error path that can call kfree(iter->trace) after the iter->trace
was assigned to tr->current_trace, which would be bad to free.
Link: http://lkml.kernel.org/r/1550060946-45984-1-git-send-email-yi.zhang@huawei.com
Cc: stable@vger.kernel.org
Fixes: d716ff71dd12 ("tracing: Remove taking of trace_types_lock in pipe files")
Signed-off-by: zhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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atomic_t variables are currently used to implement reference
counters with the following properties:
- counter is initialized to 1 using atomic_set()
- a resource is freed upon counter reaching zero
- once counter reaches zero, its further
increments aren't allowed
- counter schema uses basic atomic operations
(set, inc, inc_not_zero, dec_and_test, etc.)
Such atomic variables should be converted to a newly provided
refcount_t type and API that prevents accidental counter overflows
and underflows. This is important since overflows and underflows
can lead to use-after-free situation and be exploitable.
The variable uprobe.ref is used as pure reference counter.
Convert it to refcount_t and fix up the operations.
**Important note for maintainers:
Some functions from refcount_t API defined in lib/refcount.c
have different memory ordering guarantees than their atomic
counterparts.
The full comparison can be seen in
https://lkml.org/lkml/2017/11/15/57 and it is hopefully soon
in state to be merged to the documentation tree.
Normally the differences should not matter since refcount_t provides
enough guarantees to satisfy the refcounting use cases, but in
some rare cases it might matter.
Please double check that you don't have some undocumented
memory guarantees for this variable usage.
For the uprobe.ref it might make a difference
in following places:
- put_uprobe(): decrement in refcount_dec_and_test() only
provides RELEASE ordering and control dependency on success
vs. fully ordered atomic counterpart
Link: http://lkml.kernel.org/r/1547637627-29526-1-git-send-email-elena.reshetova@intel.com
Suggested-by: Kees Cook <keescook@chromium.org>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: David Windsor <dwindsor@gmail.com>
Reviewed-by: Hans Liljestrand <ishkamiel@gmail.com>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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Enabling of large number of functions by echoing in a large subset of the
functions in available_filter_functions can take a very long time. The
process requires testing all functions registered by the function tracer
(which is in the 10s of thousands), and doing a kallsyms lookup to convert
the ip address into a name, then comparing that name with the string passed
in.
When a function causes the function tracer to crash the system, a binary
bisect of the available_filter_functions can be done to find the culprit.
But this requires passing in half of the functions in
available_filter_functions over and over again, which makes it basically a
O(n^2) operation. With 40,000 functions, that ends up bing 1,600,000,000
opertions! And enabling this can take over 20 minutes.
As a quick speed up, if a number is passed into one of the filter files,
instead of doing a search, it just enables the function at the corresponding
line of the available_filter_functions file. That is:
# echo 50 > set_ftrace_filter
# cat set_ftrace_filter
x86_pmu_commit_txn
# head -50 available_filter_functions | tail -1
x86_pmu_commit_txn
This allows setting of half the available_filter_functions to take place in
less than a second!
# time seq 20000 > set_ftrace_filter
real 0m0.042s
user 0m0.005s
sys 0m0.015s
# wc -l set_ftrace_filter
20000 set_ftrace_filter
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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Here is an example for this change.
$ sudo perf record -e 'ftrace:function' --filter='ip==schedule'
$ sudo perf report
The output of perf before this patch:
\# Samples: 100 of event 'ftrace:function'
\# Event count (approx.): 100
\#
\# Overhead Trace output
\# ........ ......................................
\#
51.00% ffffffff81f6aaa0 <-- ffffffff81158e8d
29.00% ffffffff81f6aaa0 <-- ffffffff8116ccb2
8.00% ffffffff81f6aaa0 <-- ffffffff81f6f2ed
4.00% ffffffff81f6aaa0 <-- ffffffff811628db
4.00% ffffffff81f6aaa0 <-- ffffffff81f6ec5b
2.00% ffffffff81f6aaa0 <-- ffffffff81f6f21a
1.00% ffffffff81f6aaa0 <-- ffffffff811b04af
1.00% ffffffff81f6aaa0 <-- ffffffff8143ce17
After this patch:
\# Samples: 36 of event 'ftrace:function'
\# Event count (approx.): 36
\#
\# Overhead Trace output
\# ........ ............................................
\#
38.89% schedule <-- schedule_hrtimeout_range_clock
27.78% schedule <-- worker_thread
13.89% schedule <-- schedule_timeout
11.11% schedule <-- smpboot_thread_fn
5.56% schedule <-- rcu_gp_kthread
2.78% schedule <-- exit_to_usermode_loop
Link: http://lkml.kernel.org/r/20190209161919.32350-1-changbin.du@gmail.com
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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Commit 6b7e633fe9c2 ("tracing: Remove extra zeroing out of the ring
buffer page") removed the only caller of ring_buffer_page_len(). The
function is now unused and may be removed.
Link: http://lkml.kernel.org/r/20181228133847.106177-1-mbenes@suse.cz
Signed-off-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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This align the behavior of wakeup tracers with irqsoff latency tracer
that we record stacktrace at the beginning and end of waking up. The
stacktrace shows us what is happening in the kernel.
Link: http://lkml.kernel.org/r/20190116160249.7554-1-changbin.du@gmail.com
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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Don't mix context flags with function duration info.
Instead of this:
# tracer: wakeup_rt
#
# wakeup_rt latency trace v1.1.5 on 5.0.0-rc1-test+
# --------------------------------------------------------------------
# latency: 177 us, #545/545, CPU#0 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:8)
# -----------------
# | task: migration/0-11 (uid:0 nice:0 policy:1 rt_prio:99)
# -----------------
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| /
# REL TIME CPU TASK/PID |||| DURATION FUNCTION CALLS
# | | | | |||| | | | | | |
0 us | 0) <idle>-0 | dNh5 | /* 0:120:R + [000] 11: 0:R migration/0 */
2 us | 0) <idle>-0 | dNh5 0.000 us | (null)();
4 us | 0) <idle>-0 | dNh4 | _raw_spin_unlock() {
4 us | 0) <idle>-0 | dNh4 0.304 us | preempt_count_sub();
5 us | 0) <idle>-0 | dNh3 1.063 us | }
5 us | 0) <idle>-0 | dNh3 0.266 us | ttwu_stat();
6 us | 0) <idle>-0 | dNh3 | _raw_spin_unlock_irqrestore() {
6 us | 0) <idle>-0 | dNh3 0.273 us | preempt_count_sub();
6 us | 0) <idle>-0 | dNh2 0.818 us | }
Show this:
# tracer: wakeup
#
# wakeup latency trace v1.1.5 on 4.20.0+
# --------------------------------------------------------------------
# latency: 593 us, #674/674, CPU#0 | (M:desktop VP:0, KP:0, SP:0 HP:0 #P:4)
# -----------------
# | task: kworker/0:1H-339 (uid:0 nice:-20 policy:0 rt_prio:0)
# -----------------
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| /
# REL TIME CPU TASK/PID |||| DURATION FUNCTION CALLS
# | | | | |||| | | | | | |
0 us | 0) <idle>-0 | dNs. | | /* 0:120:R + [000] 339:100:R kworker/0:1H */
3 us | 0) <idle>-0 | dNs. | 0.000 us | (null)();
67 us | 0) <idle>-0 | dNs. | 0.721 us | ttwu_stat();
69 us | 0) <idle>-0 | dNs. | 0.607 us | _raw_spin_unlock_irqrestore();
71 us | 0) <idle>-0 | .Ns. | 0.598 us | _raw_spin_lock_irq();
72 us | 0) <idle>-0 | .Ns. | 0.584 us | _raw_spin_lock_irq();
73 us | 0) <idle>-0 | dNs. | + 11.118 us | __next_timer_interrupt();
75 us | 0) <idle>-0 | dNs. | | call_timer_fn() {
76 us | 0) <idle>-0 | dNs. | | delayed_work_timer_fn() {
76 us | 0) <idle>-0 | dNs. | | __queue_work() {
...
Link: http://lkml.kernel.org/r/20190101154614.8887-4-changbin.du@gmail.com
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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Add these info fields to funcgraph wakeup tracers:
o Show CPU info since the waker could be on a different CPU.
o Show function duration and overhead.
o Show IRQ markers.
Link: http://lkml.kernel.org/r/20190101154614.8887-3-changbin.du@gmail.com
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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As the predicat_parse() code is rather complex, commenting subtleties is
important. The switch case statement should be commented to describe that it
is only looking for two '&' or '|' together, which is why the fall through
to an error is after the check.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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There is a plan to build the kernel with -Wimplicit-fallthrough and
this place in the code produced a warning (W=1).
This commit remove the following warning:
kernel/trace/trace_events_filter.c:494:8: warning: this statement may fall through [-Wimplicit-fallthrough=]
Link: http://lkml.kernel.org/r/20190114203039.16535-2-malat@debian.org
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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There is a plan to build the kernel with -Wimplicit-fallthrough and
this place in the code produced a warning (W=1).
This commit remove the following warning:
kernel/trace/trace_probe.c:302:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
Link: http://lkml.kernel.org/r/20190114203039.16535-1-malat@debian.org
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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When function_graph is used for latency tracers, relative timestamp
is more straightforward than absolute timestamp as function trace
does. This change adds relative timestamp support to function_graph
and applies to latency tracers (wakeup and irqsoff).
Instead of:
# tracer: irqsoff
#
# irqsoff latency trace v1.1.5 on 5.0.0-rc1-test
# --------------------------------------------------------------------
# latency: 521 us, #1125/1125, CPU#2 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:8)
# -----------------
# | task: swapper/2-0 (uid:0 nice:0 policy:0 rt_prio:0)
# -----------------
# => started at: __schedule
# => ended at: _raw_spin_unlock_irq
#
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| /
# TIME CPU TASK/PID |||| DURATION FUNCTION CALLS
# | | | | |||| | | | | | |
124.974306 | 2) systemd-693 | d..1 0.000 us | __schedule();
124.974307 | 2) systemd-693 | d..1 | rcu_note_context_switch() {
124.974308 | 2) systemd-693 | d..1 0.487 us | rcu_preempt_deferred_qs();
124.974309 | 2) systemd-693 | d..1 0.451 us | rcu_qs();
124.974310 | 2) systemd-693 | d..1 2.301 us | }
[..]
124.974826 | 2) <idle>-0 | d..2 | finish_task_switch() {
124.974826 | 2) <idle>-0 | d..2 | _raw_spin_unlock_irq() {
124.974827 | 2) <idle>-0 | d..2 0.000 us | _raw_spin_unlock_irq();
124.974828 | 2) <idle>-0 | d..2 0.000 us | tracer_hardirqs_on();
<idle>-0 2d..2 552us : <stack trace>
=> __schedule
=> schedule_idle
=> do_idle
=> cpu_startup_entry
=> start_secondary
=> secondary_startup_64
Show:
# tracer: irqsoff
#
# irqsoff latency trace v1.1.5 on 5.0.0-rc1-test+
# --------------------------------------------------------------------
# latency: 511 us, #1053/1053, CPU#7 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:8)
# -----------------
# | task: swapper/7-0 (uid:0 nice:0 policy:0 rt_prio:0)
# -----------------
# => started at: __schedule
# => ended at: _raw_spin_unlock_irq
#
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| /
# REL TIME CPU TASK/PID |||| DURATION FUNCTION CALLS
# | | | | |||| | | | | | |
0 us | 7) sshd-1704 | d..1 0.000 us | __schedule();
1 us | 7) sshd-1704 | d..1 | rcu_note_context_switch() {
1 us | 7) sshd-1704 | d..1 0.611 us | rcu_preempt_deferred_qs();
2 us | 7) sshd-1704 | d..1 0.484 us | rcu_qs();
3 us | 7) sshd-1704 | d..1 2.599 us | }
[..]
509 us | 7) <idle>-0 | d..2 | finish_task_switch() {
510 us | 7) <idle>-0 | d..2 | _raw_spin_unlock_irq() {
510 us | 7) <idle>-0 | d..2 0.000 us | _raw_spin_unlock_irq();
512 us | 7) <idle>-0 | d..2 0.000 us | tracer_hardirqs_on();
<idle>-0 7d..2 543us : <stack trace>
=> __schedule
=> schedule_idle
=> do_idle
=> cpu_startup_entry
=> start_secondary
=> secondary_startup_64
Link: http://lkml.kernel.org/r/20190101154614.8887-2-changbin.du@gmail.com
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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Pull networking fixes from David Miller:
"First batch of fixes in the new merge window:
1) Double dst_cache free in act_tunnel_key, from Wenxu.
2) Avoid NULL deref in IN_DEV_MFORWARD() by failing early in the
ip_route_input_rcu() path, from Paolo Abeni.
3) Fix appletalk compile regression, from Arnd Bergmann.
4) If SLAB objects reach the TCP sendpage method we are in serious
trouble, so put a debugging check there. From Vasily Averin.
5) Memory leak in hsr layer, from Mao Wenan.
6) Only test GSO type on GSO packets, from Willem de Bruijn.
7) Fix crash in xsk_diag_put_umem(), from Eric Dumazet.
8) Fix VNIC mailbox length in nfp, from Dirk van der Merwe.
9) Fix race in ipv4 route exception handling, from Xin Long.
10) Missing DMA memory barrier in hns3 driver, from Jian Shen.
11) Use after free in __tcf_chain_put(), from Vlad Buslov.
12) Handle inet_csk_reqsk_queue_add() failures, from Guillaume Nault.
13) Return value correction when ip_mc_may_pull() fails, from Eric
Dumazet.
14) Use after free in x25_device_event(), also from Eric"
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (72 commits)
gro_cells: make sure device is up in gro_cells_receive()
vxlan: test dev->flags & IFF_UP before calling gro_cells_receive()
net/x25: fix use-after-free in x25_device_event()
isdn: mISDNinfineon: fix potential NULL pointer dereference
net: hns3: fix to stop multiple HNS reset due to the AER changes
ip: fix ip_mc_may_pull() return value
net: keep refcount warning in reqsk_free()
net: stmmac: Avoid one more sometimes uninitialized Clang warning
net: dsa: mv88e6xxx: Set correct interface mode for CPU/DSA ports
rxrpc: Fix client call queueing, waiting for channel
tcp: handle inet_csk_reqsk_queue_add() failures
net: ethernet: sun: Zero initialize class in default case in niu_add_ethtool_tcam_entry
8139too : Add support for U.S. Robotics USR997901A 10/100 Cardbus NIC
fou, fou6: avoid uninit-value in gue_err() and gue6_err()
net: sched: fix potential use-after-free in __tcf_chain_put()
vhost: silence an unused-variable warning
vsock/virtio: fix kernel panic from virtio_transport_reset_no_sock
connector: fix unsafe usage of ->real_parent
vxlan: do not need BH again in vxlan_cleanup()
net: hns3: add dma_rmb() for rx description
...
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Non-zero imm value in the second part of the ldimm64 instruction for
BPF_PSEUDO_MAP_FD is invalid, and thus must be rejected. The map fd
only ever sits in the first instructions' imm field. None of the BPF
loaders known to us are using it, so risk of regression is minimal.
For clarity and consistency, the few insn->{src_reg,imm} occurrences
are rewritten into insn[0].{src_reg,imm}. Add a test case to the BPF
selftest suite as well.
Fixes: 0246e64d9a5f ("bpf: handle pseudo BPF_LD_IMM64 insn")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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When CONFIG_BPF_SYSCALL or CONFIG_SYSCTL is disabled, we get
a warning about an unused function:
kernel/sysctl.c:3331:12: error: 'proc_dointvec_minmax_bpf_stats' defined but not used [-Werror=unused-function]
static int proc_dointvec_minmax_bpf_stats(struct ctl_table *table, int write,
The CONFIG_BPF_SYSCALL check was already handled, but the SYSCTL check
is needed on top.
Fixes: 492ecee892c2 ("bpf: enable program stats")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Christian Brauner <christian@brauner.io>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull Kbuild updates from Masahiro Yamada:
- do not generate unneeded top-level built-in.a
- let git ignore O= directory entirely
- optimize scripts/kallsyms slightly
- exclude DWARF info from *.s regardless of config options
- fix GCC toolchain search path for Clang to prepare ld.lld support
- do not generate modules.order when CONFIG_MODULES is disabled
- simplify single target rules and remove VPATH for external module
build
- allow to add optional flags to dpkg-buildpackage when building
deb-pkg
- move some compiler option tests from Makefile to Kconfig
- various Makefile cleanups
* tag 'kbuild-v5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (40 commits)
kbuild: remove scripts/basic/% build target
kbuild: use -Werror=implicit-... instead of -Werror-implicit-...
kbuild: clean up scripts/gcc-version.sh
kbuild: remove cc-version macro
kbuild: update comment block of scripts/clang-version.sh
kbuild: remove commented-out INITRD_COMPRESS
kbuild: move -gsplit-dwarf, -gdwarf-4 option tests to Kconfig
kbuild: [bin]deb-pkg: add DPKG_FLAGS variable
kbuild: move ".config not found!" message from Kconfig to Makefile
kbuild: invoke syncconfig if include/config/auto.conf.cmd is missing
kbuild: simplify single target rules
kbuild: remove empty rules for makefiles
kbuild: make -r/-R effective in top Makefile for old Make versions
kbuild: move tools_silent to a more relevant place
kbuild: compute false-positive -Wmaybe-uninitialized cases in Kconfig
kbuild: refactor cc-cross-prefix implementation
kbuild: hardcode genksyms path and remove GENKSYMS variable
scripts/gdb: refactor rules for symlink creation
kbuild: create symlink to vmlinux-gdb.py in scripts_gdb target
scripts/gdb: do not descend into scripts/gdb from scripts
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Since -Wmaybe-uninitialized was introduced by GCC 4.7, we have patched
various false positives:
- commit e74fc973b6e5 ("Turn off -Wmaybe-uninitialized when building
with -Os") turned off this option for -Os.
- commit 815eb71e7149 ("Kbuild: disable 'maybe-uninitialized' warning
for CONFIG_PROFILE_ALL_BRANCHES") turned off this option for
CONFIG_PROFILE_ALL_BRANCHES
- commit a76bcf557ef4 ("Kbuild: enable -Wmaybe-uninitialized warning
for "make W=1"") turned off this option for GCC < 4.9
Arnd provided more explanation in https://lkml.org/lkml/2017/3/14/903
I think this looks better by shifting the logic from Makefile to Kconfig.
Link: https://github.com/ClangBuiltLinux/linux/issues/350
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf updates from Thomas Gleixner:
"Perf updates and fixes:
Kernel:
- Handle events which have the bpf_event attribute set as side band
events as they carry information about BPF programs.
- Add missing switch-case fall-through comments
Libraries:
- Fix leaks and double frees in error code paths.
- Prevent buffer overflows in libtraceevent
Tools:
- Improvements in handling Intel BT/PTS
- Add BTF ELF markers to perf trace BPF programs to improve output
- Support --time, --cpu, --pid and --tid filters for perf diff
- Calculate the column width in perf annotate as the hardcoded 6
characters for the instruction are not sufficient
- Small fixes all over the place"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (38 commits)
perf/core: Mark expected switch fall-through
perf/x86/intel/uncore: Fix client IMC events return huge result
perf/ring_buffer: Use high order allocations for AUX buffers optimistically
perf data: Force perf_data__open|close zero data->file.path
perf session: Fix double free in perf_data__close
perf evsel: Probe for precise_ip with simple attr
perf tools: Read and store caps/max_precise in perf_pmu
perf hist: Fix memory leak of srcline
perf hist: Add error path into hist_entry__init
perf c2c: Fix c2c report for empty numa node
perf script python: Add Python3 support to intel-pt-events.py
perf script python: Add Python3 support to event_analyzing_sample.py
perf script python: add Python3 support to check-perf-trace.py
perf script python: Add Python3 support to futex-contention.py
perf script python: Remove mixed indentation
perf diff: Support --pid/--tid filter options
perf diff: Support --cpu filter option
perf diff: Support --time filter option
perf thread: Generalize function to copy from thread addr space from intel-bts code
perf annotate: Calculate the max instruction name, align column to that
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git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent
Pull perf/core changes from Arnaldo Carvalho de Melo:
perf bpf:
Arnaldo Carvalho de Melo:
- Automatically add BTF ELF markers to 'perf trace' BPF programs, so that
tools such as 'bpftool map dump' can pretty print map keys and values.
perf c2c:
Jiri Olsa:
- Fix report for empty NUMA node.
perf diff:
Jin Yao:
- Support --time, --cpu, --pid and --tid filter options.
perf probe:
Arnaldo Carvalho de Melo:
- Clarify error message about not finding kernel modules debuginfo.
perf record:
Jiri Olsa:
- Fixup probing for max attr.precise_ip.
perf trace:
Arnaldo Carvalho de Melo:
- Add missing %s lost in the 'msg_flags' recvmmsg arg when adding prefix suppression logic.
perf annotate:
Arnaldo Carvalho de Melo:
- Calculate the max instruction name, align column to that, removing the
hardcoded max 6 chars and cope with instructions with names longer than that,
such as vpmovmskb, vpcmpeqb, etc.
kernel:
Song Liu:
- Consider events with attr.bpf_event set as side-band.
Gustavo A. R. Silva:
- Mark expected switch fall-through in perf_event_parse_addr_filter().
Libraries:
Jiri Olsa:
- Fix leaks and double frees on error paths.
libtraceevent:
Tony Jones:
- Fix buffer overflow in arg_eval().
python scripting:
Tony Jones:
- More python3 fixes.
Trivial:
Yang Wei:
- Remove needless extra semicolon in clang C++ glue code.
Intel PT/BTS:
Adrian Hunter:
- Improve auxtrace address filter error message when there is no DSO.
- Fix divide by zero when TSC is not available.
- Further improvements to the export to sqlite/posgresql python scripts
and to the GUI sqlviewer, exporting 'parent_id' so that we have enable
the creation of call trees.
Andi Kleen:
- Generalize function to copy from thread addr space from intel-bts code.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.
This patch fixes the following warning:
kernel/events/core.c: In function ‘perf_event_parse_addr_filter’:
kernel/events/core.c:9154:11: warning: this statement may fall through [-Wimplicit-fallthrough=]
kernel = 1;
~~~~~~~^~~
kernel/events/core.c:9156:3: note: here
case IF_SRC_FILEADDR:
^~~~
Warning level 3 was used: -Wimplicit-fallthrough=3
This patch is part of the ongoing efforts to enable -Wimplicit-fallthrough.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Gustavo A. R. Silva <gustavo@embeddedor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kees Kook <keescook@chromium.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190212205430.GA8446@embeddedor
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Events with attr.bpf_event set should be considered as side-band events,
as they carry information about BPF programs.
Signed-off-by: Song Liu <songliubraving@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-team@fb.com
Cc: netdev@vger.kernel.org
Fixes: 6ee52e2a3fe4 ("perf, bpf: Introduce PERF_RECORD_BPF_EVENT")
Link: http://lkml.kernel.org/r/20190226002019.3748539-2-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.
This patch fixes the following warning:
kernel/events/core.c: In function ‘perf_event_parse_addr_filter’:
kernel/events/core.c:9154:11: warning: this statement may fall through [-Wimplicit-fallthrough=]
kernel = 1;
~~~~~~~^~~
kernel/events/core.c:9156:3: note: here
case IF_SRC_FILEADDR:
^~~~
Warning level 3 was used: -Wimplicit-fallthrough=3
This patch is part of the ongoing efforts to enable -Wimplicit-fallthrough.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: https://lkml.kernel.org/r/20190212205430.GA8446@embeddedor
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Currently, the AUX buffer allocator will use high-order allocations
for PMUs that don't support hardware scatter-gather chaining to ensure
large contiguous blocks of pages, and always use an array of single
pages otherwise.
There is, however, a tangible performance benefit in using larger chunks
of contiguous memory even in the latter case, that comes from not having
to fetch the next page's address at every page boundary. In particular,
a task running under Intel PT on an Atom CPU shows 1.5%-2% less runtime
penalty with a single multi-page output region in snapshot mode (no PMI)
than with multiple single-page output regions, from ~6% down to ~4%. For
the snapshot mode it does make a difference as it is intended to run over
long periods of time.
For this reason, change the allocation policy to always optimistically
start with the highest possible order when allocating pages for the AUX
buffer, desceding until the allocation succeeds or order zero allocation
fails.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: https://lkml.kernel.org/r/20190215114727.62648-2-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking fixes from Thomas Gleixner:
"A few fixes for lockdep:
- initialize lockdep internal RCU head after initializing RCU
- prevent use after free in a alloc_workqueue() error handling path
- plug a memory leak in the workqueue core which fails to free a
dynamically allocated lock name.
- make Clang happy"
* 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
workqueue, lockdep: Fix a memory leak in wq->lock_name
workqueue, lockdep: Fix an alloc_workqueue() error path
locking/lockdep: Only call init_rcu_head() after RCU has been initialized
locking/lockdep: Avoid a Clang warning
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The following commit:
669de8bda87b ("kernel/workqueue: Use dynamic lockdep keys for workqueues")
introduced a memory leak as wq_free_lockdep() calls kfree(wq->lock_name),
but wq_init_lockdep() does not point wq->lock_name to the newly allocated
slab object.
This can be reproduced by running LTP fallocate04 followed by oom01 tests:
unreferenced object 0xc0000005876384d8 (size 64):
comm "fallocate04", pid 26972, jiffies 4297139141 (age 40370.480s)
hex dump (first 32 bytes):
28 77 71 5f 63 6f 6d 70 6c 65 74 69 6f 6e 29 65 (wq_completion)e
78 74 34 2d 72 73 76 2d 63 6f 6e 76 65 72 73 69 xt4-rsv-conversi
backtrace:
[<00000000cb452883>] kvasprintf+0x6c/0xe0
[<000000004654ddac>] kasprintf+0x34/0x60
[<000000001c68f311>] alloc_workqueue+0x1f8/0x6ac
[<0000000003c2ad83>] ext4_fill_super+0x23d4/0x3c80 [ext4]
[<0000000006610538>] mount_bdev+0x25c/0x290
[<00000000bcf955ec>] ext4_mount+0x28/0x50 [ext4]
[<0000000016e08fd3>] legacy_get_tree+0x4c/0xb0
[<0000000042b6a5fc>] vfs_get_tree+0x6c/0x190
[<00000000268ab022>] do_mount+0xb9c/0x1100
[<00000000698e6898>] ksys_mount+0x158/0x180
[<0000000064e391fd>] sys_mount+0x20/0x30
[<00000000ba378f12>] system_call+0x5c/0x70
Signed-off-by: Qian Cai <cai@lca.pw>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: catalin.marinas@arm.com
Cc: jiangshanlai@gmail.com
Cc: tj@kernel.org
Fixes: 669de8bda87b ("kernel/workqueue: Use dynamic lockdep keys for workqueues")
Link: https://lkml.kernel.org/r/20190307002731.47371-1-cai@lca.pw
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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This patch fixes a use-after-free and a memory leak in an alloc_workqueue()
error path.
Repoted by syzkaller and KASAN:
BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:197 [inline]
BUG: KASAN: use-after-free in lockdep_register_key+0x3b9/0x490 kernel/locking/lockdep.c:1023
Read of size 8 at addr ffff888090fc2698 by task syz-executor134/7858
CPU: 1 PID: 7858 Comm: syz-executor134 Not tainted 5.0.0-rc8-next-20190301 #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
__asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
__read_once_size include/linux/compiler.h:197 [inline]
lockdep_register_key+0x3b9/0x490 kernel/locking/lockdep.c:1023
wq_init_lockdep kernel/workqueue.c:3444 [inline]
alloc_workqueue+0x427/0xe70 kernel/workqueue.c:4263
ucma_open+0x76/0x290 drivers/infiniband/core/ucma.c:1732
misc_open+0x398/0x4c0 drivers/char/misc.c:141
chrdev_open+0x247/0x6b0 fs/char_dev.c:417
do_dentry_open+0x488/0x1160 fs/open.c:771
vfs_open+0xa0/0xd0 fs/open.c:880
do_last fs/namei.c:3416 [inline]
path_openat+0x10e9/0x46e0 fs/namei.c:3533
do_filp_open+0x1a1/0x280 fs/namei.c:3563
do_sys_open+0x3fe/0x5d0 fs/open.c:1063
__do_sys_openat fs/open.c:1090 [inline]
__se_sys_openat fs/open.c:1084 [inline]
__x64_sys_openat+0x9d/0x100 fs/open.c:1084
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Allocated by task 7789:
save_stack+0x45/0xd0 mm/kasan/common.c:75
set_track mm/kasan/common.c:87 [inline]
__kasan_kmalloc mm/kasan/common.c:497 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:511
__do_kmalloc mm/slab.c:3726 [inline]
__kmalloc+0x15c/0x740 mm/slab.c:3735
kmalloc include/linux/slab.h:553 [inline]
kzalloc include/linux/slab.h:743 [inline]
alloc_workqueue+0x13c/0xe70 kernel/workqueue.c:4236
ucma_open+0x76/0x290 drivers/infiniband/core/ucma.c:1732
misc_open+0x398/0x4c0 drivers/char/misc.c:141
chrdev_open+0x247/0x6b0 fs/char_dev.c:417
do_dentry_open+0x488/0x1160 fs/open.c:771
vfs_open+0xa0/0xd0 fs/open.c:880
do_last fs/namei.c:3416 [inline]
path_openat+0x10e9/0x46e0 fs/namei.c:3533
do_filp_open+0x1a1/0x280 fs/namei.c:3563
do_sys_open+0x3fe/0x5d0 fs/open.c:1063
__do_sys_openat fs/open.c:1090 [inline]
__se_sys_openat fs/open.c:1084 [inline]
__x64_sys_openat+0x9d/0x100 fs/open.c:1084
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 7789:
save_stack+0x45/0xd0 mm/kasan/common.c:75
set_track mm/kasan/common.c:87 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:459
kasan_slab_free+0xe/0x10 mm/kasan/common.c:467
__cache_free mm/slab.c:3498 [inline]
kfree+0xcf/0x230 mm/slab.c:3821
alloc_workqueue+0xc3e/0xe70 kernel/workqueue.c:4295
ucma_open+0x76/0x290 drivers/infiniband/core/ucma.c:1732
misc_open+0x398/0x4c0 drivers/char/misc.c:141
chrdev_open+0x247/0x6b0 fs/char_dev.c:417
do_dentry_open+0x488/0x1160 fs/open.c:771
vfs_open+0xa0/0xd0 fs/open.c:880
do_last fs/namei.c:3416 [inline]
path_openat+0x10e9/0x46e0 fs/namei.c:3533
do_filp_open+0x1a1/0x280 fs/namei.c:3563
do_sys_open+0x3fe/0x5d0 fs/open.c:1063
__do_sys_openat fs/open.c:1090 [inline]
__se_sys_openat fs/open.c:1084 [inline]
__x64_sys_openat+0x9d/0x100 fs/open.c:1084
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff888090fc2580
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 280 bytes inside of
512-byte region [ffff888090fc2580, ffff888090fc2780)
Reported-by: syzbot+17335689e239ce135d8b@syzkaller.appspotmail.com
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Fixes: 669de8bda87b ("kernel/workqueue: Use dynamic lockdep keys for workqueues")
Link: https://lkml.kernel.org/r/20190303220046.29448-1-bvanassche@acm.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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init_data_structures_once() is called for the first time before RCU has
been initialized. Make sure that init_rcu_head() is called before the
RCU head is used and after RCU has been initialized.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: longman@redhat.com
Link: https://lkml.kernel.org/r/c20aa0f0-42ab-a884-d931-7d4ec2bf0cdc@acm.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Clang warns about a tentative array definition without a length:
kernel/locking/lockdep.c:845:12: error: tentative array definition assumed to have one element [-Werror]
There is no real reason to do this here, so just set the same length as
in the real definition later in the same file. It has to be hidden in
an #ifdef or annotated __maybe_unused though, to avoid the unused-variable
warning if CONFIG_PROVE_LOCKING is disabled.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Frederic Weisbecker <frederic@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Waiman Long <longman@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Link: https://lkml.kernel.org/r/20190307075222.3424524-1-arnd@arndb.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull watchdog core update from Thomas Gleixner:
"A single commit adding a command line parameter which allows to set
the watchdog threshold on the kernel command-line, so kernels with
massive debug facilities enabled won't trigger the watchdog during
early boot and before the threshold can be changed via sysctl"
* 'core-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
watchdog/core: Add watchdog_thresh command line parameter
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The hard and soft lockup detector threshold has a default value of 10
seconds which can only be changed via sysctl.
During early boot lockup detection can trigger when noisy debugging emits
a large amount of messages to the console, but there is no way to set a
larger threshold on the kernel command line. The detector can only be
completely disabled.
Add a new watchdog_thresh= command line parameter to allow boot time
control over the threshold. It works in the same way as the sysctl and
affects both the soft and the hard lockup detectors.
Signed-off-by: Laurence Oberman <loberman@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: rdunlap@infradead.org
Cc: prarit@redhat.com
Link: https://lkml.kernel.org/r/1541079018-13953-1-git-send-email-loberman@redhat.com
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Pull virtio updates from Michael Tsirkin:
"Several fixes, most notably fix for virtio on swiotlb systems"
* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
vhost: silence an unused-variable warning
virtio: hint if callbacks surprisingly might sleep
virtio-ccw: wire up ->bus_name callback
s390/virtio: handle find on invalid queue gracefully
virtio-ccw: diag 500 may return a negative cookie
virtio_balloon: remove the unnecessary 0-initialization
virtio-balloon: improve update_balloon_size_func
virtio-blk: Consider virtio_max_dma_size() for maximum segment size
virtio: Introduce virtio_max_dma_size()
dma: Introduce dma_max_mapping_size()
swiotlb: Add is_swiotlb_active() function
swiotlb: Introduce swiotlb_max_mapping_size()
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The function returns the maximum size that can be mapped
using DMA-API functions. The patch also adds the
implementation for direct DMA and a new dma_map_ops pointer
so that other implementations can expose their limit.
Cc: stable@vger.kernel.org
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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This function will be used from dma_direct code to determine
the maximum segment size of a dma mapping.
Cc: stable@vger.kernel.org
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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The function returns the maximum size that can be remapped
by the SWIOTLB implementation. This function will be later
exposed to users through the DMA-API.
Cc: stable@vger.kernel.org
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Pull DMA mapping updates from Christoph Hellwig:
- add debugfs support for dumping dma-debug information (Corentin
Labbe)
- Kconfig cleanups (Andy Shevchenko and me)
- debugfs cleanups (Greg Kroah-Hartman)
- improve dma_map_resource and use it in the media code
- arch_setup_dma_ops / arch_teardown_dma_ops cleanups
- various small cleanups and improvements for the per-device coherent
allocator
- make the DMA mask an upper bound and don't fail "too large" dma mask
in the remaning two architectures - this will allow big driver
cleanups in the following merge windows
* tag 'dma-mapping-5.1' of git://git.infradead.org/users/hch/dma-mapping: (21 commits)
Documentation/DMA-API-HOWTO: update dma_mask sections
sparc64/pci_sun4v: allow large DMA masks
sparc64/iommu: allow large DMA masks
sparc64: refactor the ali DMA quirk
ccio: allow large DMA masks
dma-mapping: remove the DMA_MEMORY_EXCLUSIVE flag
dma-mapping: remove dma_mark_declared_memory_occupied
dma-mapping: move CONFIG_DMA_CMA to kernel/dma/Kconfig
dma-mapping: improve selection of dma_declare_coherent availability
dma-mapping: remove an incorrect __iommem annotation
of: select OF_RESERVED_MEM automatically
device.h: dma_mem is only needed for HAVE_GENERIC_DMA_COHERENT
mfd/sm501: depend on HAS_DMA
dma-mapping: add a kconfig symbol for arch_teardown_dma_ops availability
dma-mapping: add a kconfig symbol for arch_setup_dma_ops availability
dma-mapping: move debug configuration options to kernel/dma
dma-debug: add dumping facility via debugfs
dma: debug: no need to check return value of debugfs_create functions
videobuf2: replace a layering violation with dma_map_resource
dma-mapping: don't BUG when calling dma_map_resource on RAM
...
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All users of dma_declare_coherent want their allocations to be
exclusive, so default to exclusive allocations.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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This API is not used anywhere, so remove it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
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This is where all the related code already lives.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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This API is primarily used through DT entries, but two architectures
and two drivers call it directly. So instead of selecting the config
symbol for random architectures pull it in implicitly for the actual
users. Also rename the Kconfig option to describe the feature better.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Paul Burton <paul.burton@mips.com> # MIPS
Acked-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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memmap return a regular void pointer, not and __iomem one.
Signed-off-by: Christoph Hellwig <hch@lst.de>
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Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com> # arm64
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Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Paul Burton <paul.burton@mips.com> # MIPS
Acked-by: Catalin Marinas <catalin.marinas@arm.com> # arm64
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This is a follow up to the commit cf65a0f6f6ff
("dma-mapping: move all DMA mapping code to kernel/dma")
which moved source code of DMA API to kernel/dma folder. Since there is
no file left in the lib that require DMA API debugging options move the
latter to kernel/dma as well.
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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While debugging a DMA mapping leak, I needed to access
debug_dma_dump_mappings() but easily from user space.
This patch adds a /sys/kernel/debug/dma-api/dump file which contain all
current DMA mapping.
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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When calling debugfs functions, there is no need to ever check the
return value. The function can work or not, but the code logic should
never do something different based on this.
Also delete the variables for the file dentries for the debugfs entries
as they are never used at all once they are created.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
[hch: moved dma_debug_dent to function scope and renamed it]
Signed-off-by: Christoph Hellwig <hch@lst.de>
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Instead provide a proper implementation in the direct mapping code, and
also wire it up for arm and powerpc, leaving an error return for all the
IOMMU or virtual mapping instances for which we'd have to wire up an
actual implementation
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
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