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* rcu: permit suppressing current grace period's CPU stall warningsPaul E. McKenney2010-08-205-0/+44
| | | | | | | | | | | | | | | | When using a kernel debugger, a long sojourn in the debugger can get you lots of RCU CPU stall warnings once you resume. This might not be helpful, especially if you are using the system console. This patch therefore allows RCU CPU stall warnings to be suppressed, but only for the duration of the current set of grace periods. This differs from Jason's original patch in that it adds support for tiny RCU and preemptible RCU, and uses a slightly different method for suppressing the RCU CPU stall warning messages. Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Tested-by: Jason Wessel <jason.wessel@windriver.com>
* rcu: refer RCU CPU stall-warning victims to stallwarn.txtPaul E. McKenney2010-08-201-2/+10
| | | | | | | | | | There is some documentation on RCU CPU stall warnings contained in Documentation/RCU/stallwarn.txt, but it will not be apparent to someone who runs into such a warning while under time pressure. This commit therefore adds comments preceding the printk()s pointing out the location of this documentation. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* rcu: update obsolete rcu_read_lock() comment.Paul E. McKenney2010-08-201-1/+14
| | | | | | | | | The comment says that blocking is illegal in rcu_read_lock()-style RCU read-side critical sections, which is no longer entirely true given preemptible RCU. This commit provides a fix. Suggested-by: David Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* rcu: Add a TINY_PREEMPT_RCUPaul E. McKenney2010-08-2010-68/+717
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement a small-memory-footprint uniprocessor-only implementation of preemptible RCU. This implementation uses but a single blocked-tasks list rather than the combinatorial number used per leaf rcu_node by TREE_PREEMPT_RCU, which reduces memory consumption and greatly simplifies processing. This version also takes advantage of uniprocessor execution to accelerate grace periods in the case where there are no readers. The general design is otherwise broadly similar to that of TREE_PREEMPT_RCU. This implementation is a step towards having RCU implementation driven off of the SMP and PREEMPT kernel configuration variables, which can happen once this implementation has accumulated sufficient experience. Removed ACCESS_ONCE() from __rcu_read_unlock() and added barrier() as suggested by Steve Rostedt in order to avoid the compiler-reordering issue noted by Mathieu Desnoyers (http://lkml.org/lkml/2010/8/16/183). As can be seen below, CONFIG_TINY_PREEMPT_RCU represents almost 5Kbyte savings compared to CONFIG_TREE_PREEMPT_RCU. Of course, for non-real-time workloads, CONFIG_TINY_RCU is even better. CONFIG_TREE_PREEMPT_RCU text data bss dec filename 13 0 0 13 kernel/rcupdate.o 6170 825 28 7023 kernel/rcutree.o ---- 7026 Total CONFIG_TINY_PREEMPT_RCU text data bss dec filename 13 0 0 13 kernel/rcupdate.o 2081 81 8 2170 kernel/rcutiny.o ---- 2183 Total CONFIG_TINY_RCU (non-preemptible) text data bss dec filename 13 0 0 13 kernel/rcupdate.o 719 25 0 744 kernel/rcutiny.o --- 757 Total Requested-by: Loïc Minier <loic.minier@canonical.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* rcu: Fix RCU_FANOUT help messagePaul E. McKenney2010-08-191-3/+6
| | | | | | | | | | | | Commit cf244dc01bf68 added a fourth level to the TREE_RCU hierarchy, but the RCU_FANOUT help message still said "cube root". This commit fixes this to "fourth root" and also emphasizes that production systems are well-served by the default. (Stress-testing RCU itself uses small RCU_FANOUT values in order to test large-system code paths on small(er) systems.) Located-by: John Kacur <jkacur@redhat.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* rcu: Allow RCU CPU stall warnings to be off at boot, but manually enablablePaul E. McKenney2010-08-193-1/+20
| | | | | | | | | | | | | | | | | | | | | Currently, if RCU CPU stall warnings are enabled, they are enabled immediately upon boot. They can be manually disabled via /sys (and also re-enabled via /sys), and are automatically disabled upon panic. However, some users need RCU CPU stalls to be disabled at boot time, but to be enabled without rebuilding/rebooting. For example, someone running a real-time application in production might not want the additional latency of RCU CPU stall detection in normal operation, but might need to enable it at any point for fault isolation purposes. This commit therefore provides a new CONFIG_RCU_CPU_STALL_DETECTOR_RUNNABLE kernel configuration parameter that maintains the current behavior (enable at boot) by default, but allows a kernel to be configured with RCU CPU stall detection built into the kernel, but disabled at boot time. Requested-by: Clark Williams <williams@redhat.com> Requested-by: John Kacur <jkacur@redhat.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* rcu: restrict TREE_RCU to SMP builds with !PREEMPTPaul E. McKenney2010-08-191-0/+1
| | | | | | | | | | Because both TINY_RCU and TREE_PREEMPT_RCU have been in mainline for several releases, it is time to restrict the use of TREE_RCU to SMP non-preemptible systems. This reduces testing/validation effort. This commit is a first step towards driving the selection of RCU implementation directly off of the SMP and PREEMPT configuration parameters. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* rcu: allow RCU CPU stall warning messages to be controlled in /sysPaul E. McKenney2010-08-191-1/+1
| | | | | | | | Set the permissions of the rcu_cpu_stall_suppress to 644 to enable RCU CPU stall warnings to be enabled and disabled at runtime via sysfs. Suggested-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* Update call_rcu() usage, add synchronize_rcu()Paul E. McKenney2010-08-191-2/+4
| | | | | | Reported-by: Kyle Hubert <khubert@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* Update documentation to note the passage of INIT_RCU_HEAD()Paul E. McKenney2010-08-191-8/+0
| | | | | | Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcu head remove initMathieu Desnoyers2010-08-191-6/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | RCU heads really don't need to be initialized. Their state before call_rcu() really does not matter. We need to keep init/destroy_rcu_head_on_stack() though, since we want debugobjects to be able to keep track of these objects. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> CC: David S. Miller <davem@davemloft.net> CC: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> CC: akpm@linux-foundation.org CC: mingo@elte.hu CC: laijs@cn.fujitsu.com CC: dipankar@in.ibm.com CC: josh@joshtriplett.org CC: dvhltc@us.ibm.com CC: niv@us.ibm.com CC: tglx@linutronix.de CC: peterz@infradead.org CC: rostedt@goodmis.org CC: Valdis.Kletnieks@vt.edu CC: dhowells@redhat.com CC: eric.dumazet@gmail.com CC: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* kernel: __rcu annotationsArnd Bergmann2010-08-196-11/+11
| | | | | | | | | | | This adds annotations for RCU operations in core kernel components Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* idr: __rcu annotationsArnd Bergmann2010-08-191-2/+2
| | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Manfred Spraul <manfred@colorfullife.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* radix-tree: __rcu annotationsArnd Bergmann2010-08-192-2/+4
| | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Nick Piggin <npiggin@suse.de> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* notifiers: __rcu annotationsArnd Bergmann2010-08-191-5/+5
| | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcu: improve kerneldoc for rcu_read_lock(), call_rcu(), and synchronize_rcu()Paul E. McKenney2010-08-192-10/+14
| | | | | | | | | Make it explicit that new RCU read-side critical sections that start after call_rcu() and synchronize_rcu() start might still be running after the end of the relevant grace period. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcu: add boot parameter to suppress RCU CPU stall warning messagesPaul E. McKenney2010-08-191-3/+8
| | | | | | | | | | | | | | | | | Although the RCU CPU stall warning messages are a very good way to alert people to a problem, once alerted, it is sometimes helpful to shut them off in order to avoid obscuring other messages that might be being used to track down the problem. Although you can rebuild the kernel with CONFIG_RCU_CPU_STALL_DETECTOR=n, this is sometimes inconvenient. This commit therefore adds a boot parameter named "rcu_cpu_stall_suppress" that shuts these messages off without requiring a rebuild (though a reboot might be needed for those not brave enough to patch their kernel while it is running). This message-suppression was already in place for the panic case, so this commit need only rename the variable and export it via module_param(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* rcu: make CPU stall warning timeout configurablePaul E. McKenney2010-08-192-2/+14
| | | | | | | | | | Also set the default to 60 seconds, up from the previous hard-coded timeout of 10 seconds. This allows people who care to set short timeouts, while avoiding people with unusual configurations (make randconfig!!!) from being bothered with spurious CPU stall warnings. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* Add RCU check for find_task_by_vpid().Tetsuo Handa2010-08-192-5/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | find_task_by_vpid() says "Must be called under rcu_read_lock().". But due to commit 3120438 "rcu: Disable lockdep checking in RCU list-traversal primitives", we are currently unable to catch "find_task_by_vpid() with tasklist_lock held but RCU lock not held" errors due to the RCU-lockdep checks being suppressed in the RCU variants of the struct list_head traversals. This commit therefore places an explicit check for being in an RCU read-side critical section in find_task_by_pid_ns(). =================================================== [ INFO: suspicious rcu_dereference_check() usage. ] --------------------------------------------------- kernel/pid.c:386 invoked rcu_dereference_check() without protection! other info that might help us debug this: rcu_scheduler_active = 1, debug_locks = 1 1 lock held by rc.sysinit/1102: #0: (tasklist_lock){.+.+..}, at: [<c1048340>] sys_setpgid+0x40/0x160 stack backtrace: Pid: 1102, comm: rc.sysinit Not tainted 2.6.35-rc3-dirty #1 Call Trace: [<c105e714>] lockdep_rcu_dereference+0x94/0xb0 [<c104b4cd>] find_task_by_pid_ns+0x6d/0x70 [<c104b4e8>] find_task_by_vpid+0x18/0x20 [<c1048347>] sys_setpgid+0x47/0x160 [<c1002b50>] sysenter_do_call+0x12/0x36 Commit updated to use a new rcu_lockdep_assert() exported API rather than the old internal __do_rcu_dereference(). Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcu: simplify the usage of percpu dataLai Jiangshan2010-08-194-31/+19
| | | | | | | | | | | | | | &percpu_data is compatible with allocated percpu data. And we use it and remove the "->rda[NR_CPUS]" array, saving significant storage on systems with large numbers of CPUs. This does add an additional level of indirection and thus an additional cache line referenced, but because ->rda is not used on the read side, this is OK. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Reviewed-by: Tejun Heo <tj@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: add random preemptionLai Jiangshan2010-08-191-0/+6
| | | | | | | | | | | | | Add random preemption to help we to torture the preemptable rcu. srcu_read_delay() also calls rcu_read_delay() for shorter delays. Added comment to preempt_schedule() call indicating that no quiescent states happen if preemption is disabled. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcu: add shiny new debug assists to Documentation/RCU/checklist.txtPaul E. McKenney2010-08-191-0/+23
| | | | | | | | | Add a section describing PROVE_RCU, DEBUG_OBJECTS_RCU_HEAD, and the __rcu sparse checking to the RCU checklist. Suggested-by: David Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* kvm: add __rcu annotationsArnd Bergmann2010-08-191-1/+1
| | | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Avi Kivity <avi@redhat.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* net/netfilter: __rcu annotationsArnd Bergmann2010-08-198-10/+10
| | | | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Patrick McHardy <kaber@trash.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <eric.dumazet@gmail.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* input: __rcu annotationsArnd Bergmann2010-08-192-2/+2
| | | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* nfs: __rcu annotationsArnd Bergmann2010-08-192-3/+3
| | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* keys: __rcu annotationsArnd Bergmann2010-08-192-2/+3
| | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: David Howells <dhowells@redhat.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* credentials: rcu annotationArnd Bergmann2010-08-191-2/+2
| | | | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Acked-by: David Howells <dhowells@redhat.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* cgroups: __rcu annotationsArnd Bergmann2010-08-193-4/+4
| | | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Paul Menage <menage@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rculist: avoid __rcu annotationsArnd Bergmann2010-08-193-25/+46
| | | | | | | | | | | | | | | | This avoids warnings from missing __rcu annotations in the rculist implementation, making it possible to use the same lists in both RCU and non-RCU cases. We can add rculist annotations later, together with lockdep support for rculist, which is missing as well, but that may involve changing all the users. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcu: define __rcu address space modifier for sparsePaul E. McKenney2010-08-195-145/+257
| | | | | | | | | | | | | | | | | | | | | | | | This commit provides definitions for the __rcu annotation defined earlier. This annotation permits sparse to check for correct use of RCU-protected pointers. If a pointer that is annotated with __rcu is accessed directly (as opposed to via rcu_dereference(), rcu_assign_pointer(), or one of their variants), sparse can be made to complain. To enable such complaints, use the new default-disabled CONFIG_SPARSE_RCU_POINTER kernel configuration option. Please note that these sparse complaints are intended to be a debugging aid, -not- a code-style-enforcement mechanism. There are special rcu_dereference_protected() and rcu_access_pointer() accessors for use when RCU read-side protection is not required, for example, when no other CPU has access to the data structure in question or while the current CPU hold the update-side lock. This patch also updates a number of docbook comments that were showing their age. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Christopher Li <sparse@chrisli.org> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* net: convert to rcu_dereference_index_check()Paul E. McKenney2010-08-191-1/+2
| | | | | | | | | | | | The task_cls_classid() function applies rcu_dereference() to integers, which does not work with the shiny new sparse-based checking in rcu_dereference(). This commit therefore moves to the new RCU API rcu_dereference_index_check(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
* Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6Linus Torvalds2010-08-1810-24/+68
|\ | | | | | | | | | | | | | | | | | | | | | | | | * 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6: NFS: Fix an Oops in the NFSv4 atomic open code NFS: Fix the selection of security flavours in Kconfig NFS: fix the return value of nfs_file_fsync() rpcrdma: Fix SQ size calculation when memreg is FRMR xprtrdma: Do not truncate iova_start values in frmr registrations. nfs: Remove redundant NULL check upon kfree() nfs: Add "lookupcache" to displayed mount options NFS: allow close-to-open cache semantics to apply to root of NFS filesystem SUNRPC: fix NFS client over TCP hangs due to packet loss (Bug 16494)
| * NFS: Fix an Oops in the NFSv4 atomic open codeTrond Myklebust2010-08-182-4/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Adam Lackorzynski reports: with 2.6.35.2 I'm getting this reproducible Oops: [ 110.825396] BUG: unable to handle kernel NULL pointer dereference at (null) [ 110.828638] IP: [<ffffffff811247b7>] encode_attrs+0x1a/0x2a4 [ 110.828638] PGD be89f067 PUD bf18f067 PMD 0 [ 110.828638] Oops: 0000 [#1] SMP [ 110.828638] last sysfs file: /sys/class/net/lo/operstate [ 110.828638] CPU 2 [ 110.828638] Modules linked in: rtc_cmos rtc_core rtc_lib amd64_edac_mod i2c_amd756 edac_core i2c_core dm_mirror dm_region_hash dm_log dm_snapshot sg sr_mod usb_storage ohci_hcd mptspi tg3 mptscsih mptbase usbcore nls_base [last unloaded: scsi_wait_scan] [ 110.828638] [ 110.828638] Pid: 11264, comm: setchecksum Not tainted 2.6.35.2 #1 [ 110.828638] RIP: 0010:[<ffffffff811247b7>] [<ffffffff811247b7>] encode_attrs+0x1a/0x2a4 [ 110.828638] RSP: 0000:ffff88003bf5b878 EFLAGS: 00010296 [ 110.828638] RAX: ffff8800bddb48a8 RBX: ffff88003bf5bb18 RCX: 0000000000000000 [ 110.828638] RDX: ffff8800be258800 RSI: 0000000000000000 RDI: ffff88003bf5b9f8 [ 110.828638] RBP: 0000000000000000 R08: ffff8800bddb48a8 R09: 0000000000000004 [ 110.828638] R10: 0000000000000003 R11: ffff8800be779000 R12: ffff8800be258800 [ 110.828638] R13: ffff88003bf5b9f8 R14: ffff88003bf5bb20 R15: ffff8800be258800 [ 110.828638] FS: 0000000000000000(0000) GS:ffff880041e00000(0063) knlGS:00000000556bd6b0 [ 110.828638] CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b [ 110.828638] CR2: 0000000000000000 CR3: 00000000be8ef000 CR4: 00000000000006e0 [ 110.828638] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 110.828638] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 110.828638] Process setchecksum (pid: 11264, threadinfo ffff88003bf5a000, task ffff88003f232210) [ 110.828638] Stack: [ 110.828638] 0000000000000000 ffff8800bfbcf920 0000000000000000 0000000000000ffe [ 110.828638] <0> 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 110.828638] <0> 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 110.828638] Call Trace: [ 110.828638] [<ffffffff81124c1f>] ? nfs4_xdr_enc_setattr+0x90/0xb4 [ 110.828638] [<ffffffff81371161>] ? call_transmit+0x1c3/0x24a [ 110.828638] [<ffffffff813774d9>] ? __rpc_execute+0x78/0x22a [ 110.828638] [<ffffffff81371a91>] ? rpc_run_task+0x21/0x2b [ 110.828638] [<ffffffff81371b7e>] ? rpc_call_sync+0x3d/0x5d [ 110.828638] [<ffffffff8111e284>] ? _nfs4_do_setattr+0x11b/0x147 [ 110.828638] [<ffffffff81109466>] ? nfs_init_locked+0x0/0x32 [ 110.828638] [<ffffffff810ac521>] ? ifind+0x4e/0x90 [ 110.828638] [<ffffffff8111e2fb>] ? nfs4_do_setattr+0x4b/0x6e [ 110.828638] [<ffffffff8111e634>] ? nfs4_do_open+0x291/0x3a6 [ 110.828638] [<ffffffff8111ed81>] ? nfs4_open_revalidate+0x63/0x14a [ 110.828638] [<ffffffff811056c4>] ? nfs_open_revalidate+0xd7/0x161 [ 110.828638] [<ffffffff810a2de4>] ? do_lookup+0x1a4/0x201 [ 110.828638] [<ffffffff810a4733>] ? link_path_walk+0x6a/0x9d5 [ 110.828638] [<ffffffff810a42b6>] ? do_last+0x17b/0x58e [ 110.828638] [<ffffffff810a5fbe>] ? do_filp_open+0x1bd/0x56e [ 110.828638] [<ffffffff811cd5e0>] ? _atomic_dec_and_lock+0x30/0x48 [ 110.828638] [<ffffffff810a9b1b>] ? dput+0x37/0x152 [ 110.828638] [<ffffffff810ae063>] ? alloc_fd+0x69/0x10a [ 110.828638] [<ffffffff81099f39>] ? do_sys_open+0x56/0x100 [ 110.828638] [<ffffffff81027a22>] ? ia32_sysret+0x0/0x5 [ 110.828638] Code: 83 f1 01 e8 f5 ca ff ff 48 83 c4 50 5b 5d 41 5c c3 41 57 41 56 41 55 49 89 fd 41 54 49 89 d4 55 48 89 f5 53 48 81 ec 18 01 00 00 <8b> 06 89 c2 83 e2 08 83 fa 01 19 db 83 e3 f8 83 c3 18 a8 01 8d [ 110.828638] RIP [<ffffffff811247b7>] encode_attrs+0x1a/0x2a4 [ 110.828638] RSP <ffff88003bf5b878> [ 110.828638] CR2: 0000000000000000 [ 112.840396] ---[ end trace 95282e83fd77358f ]--- We need to ensure that the O_EXCL flag is turned off if the user doesn't set O_CREAT. Cc: stable@kernel.org Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFS: Fix the selection of security flavours in KconfigTrond Myklebust2010-08-173-6/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Randy Dunlap reports: ERROR: "svc_gss_principal" [fs/nfs/nfs.ko] undefined! because in fs/nfs/Kconfig, NFS_V4 selects RPCSEC_GSS_KRB5 and/or in fs/nfsd/Kconfig, NFSD_V4 selects RPCSEC_GSS_KRB5. RPCSEC_GSS_KRB5 does 5 selects, but none of these is enforced/followed by the fs/nfs[d]/Kconfig configs: select SUNRPC_GSS select CRYPTO select CRYPTO_MD5 select CRYPTO_DES select CRYPTO_CBC Reported-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: J. Bruce Fields <bfields@fieldses.org> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFS: fix the return value of nfs_file_fsync()J. R. Okajima2010-08-111-1/+1
| | | | | | | | | | | | | | | | | | By the commit af7fa16 2010-08-03 NFS: Fix up the fsync code close(2) became returning the non-zero value even if it went well. nfs_file_fsync() should return 0 when "status" is positive. Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * rpcrdma: Fix SQ size calculation when memreg is FRMRTom Tucker2010-08-112-4/+18
| | | | | | | | | | | | | | | | This patch updates the computation to include the worst case situation where three FRMR are required to map a single RPC REQ. Signed-off-by: Tom Tucker <tom@ogc.us> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * xprtrdma: Do not truncate iova_start values in frmr registrations.Steve Wise2010-08-111-1/+1
| | | | | | | | | | | | | | | | | | A bad cast causes the iova_start, which in this case is a 64b DMA bus address, to be truncated on 32b systems. This breaks frmrs on 32b systems. No cast is needed. Signed-off-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * nfs: Remove redundant NULL check upon kfree()Davidlohr Bueso2010-08-111-2/+1
| | | | | | | | | | Signed-off-by: Davidlohr Bueso <dave@gnu.org> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * nfs: Add "lookupcache" to displayed mount optionsPatrick J. LoPresti2010-08-101-0/+7
| | | | | | | | | | | | | | | | | | | | | | Running "cat /proc/mounts" fails to display the "lookupcache" option. This oversight cost me a bunch of wasted time recently. The following simple patch fixes it. CC: stable <stable@kernel.org> Signed-off-by: Patrick LoPresti <lopresti@gmail.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * NFS: allow close-to-open cache semantics to apply to root of NFS filesystemNeil Brown2010-08-101-0/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | To obey NFS cache semantics, the client must verify the cached attributes when a file is opened. In most cases this is done by a call to d_validate as one of the last steps in path_walk. However for the root of a filesystem, d_validate is only ever called on the mounted-on filesystem (except when the path ends '.' or '..'). So NFS has no chance to validate the attributes. So, in nfs_opendir, we revalidate the attributes if the opened directory is the mountpoint. This may cause double-validation for "." and ".." lookups, but that is better than missing regular /path/name lookups completely. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * SUNRPC: fix NFS client over TCP hangs due to packet loss (Bug 16494)Andy Chittenden2010-08-101-6/+22
| | | | | | | | | | | | | | | | | | When reusing a TCP connection, ensure that it's aborted if a previous shutdown attempt has been made on that connection so that the RPC over TCP recovery mechanism succeeds. Signed-off-by: Andy Chittenden <andyc.bluearc@gmail.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* | Merge branch 'for-linus' of ↵Linus Torvalds2010-08-185-6/+20
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid: USB HID: Add ID for eGalax Multitouch used in JooJoo tablet HID: hiddev: fix memory corruption due to invalid intfdata HID: hiddev: protect against disconnect/NULL-dereference race HID: picolcd: correct ordering of framebuffer freeing HID: picolcd: testing the wrong variable
| * | USB HID: Add ID for eGalax Multitouch used in JooJoo tabletChris Ball2010-08-163-0/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The JooJoo tablet (http://thejoojoo.com/) contains an "eGalax Inc. USB TouchController", and this patch hooks it up to the egalax-touch driver. Without the patch we don't get any cursor motion, since it comes through Z/RX rather than X/Y. (The egalax-touch driver does not yet generate a correct event sequence for the "serial" protocol used by this device, though -- see the note added to the code, which comes from research by Stéphane Chatty.) Cc: Jiri Kosina <jkosina@suse.cz> Cc: Stéphane Chatty <chatty@enac.fr> Signed-off-by: Chris Ball <cjb@laptop.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
| * | HID: hiddev: fix memory corruption due to invalid intfdataJiri Kosina2010-08-131-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit bd25f4dd6972755579d0 ("HID: hiddev: use usb_find_interface, get rid of BKL") introduced using of private intfdata in hiddev for purpose of storing hiddev pointer. This is a problem, because intf pointer is already being set to struct hid_device pointer by HID core. This obviously lead to memory corruptions at device disconnect time, such as WARNING: at lib/kobject.c:595 kobject_put+0x37/0x4b() kobject: '(null)' (ffff88011e9cd898): is not initialized, yet kobject_put() is being called. Convert hiddev into accessing hiddev through struct hid_device which is in intfdata already. Reported-and-tested-by: Markus Trippelsdorf <markus@trippelsdorf.de> Reported-and-tested-by: Heinz Diehl <htd@fritha.org> Reported-and-tested-by: Alan Ott <alan@signal11.us> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
| * | HID: hiddev: protect against disconnect/NULL-dereference raceChris Ball2010-08-131-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | One of our users reports consistently hitting a NULL dereference that resolves to the "hid_to_usb_dev(hid);" call in hiddev_ioctl(), when disconnecting a Lego WeDo USB HID device from an OLPC XO running Scratch software. There's a FIXME comment and a guard against the dereference, but that happens farther down the function than the initial dereference does. This patch moves the call to be below the guard, and the user reports that it fixes the problem for him. OLPC bug report: http://dev.laptop.org/ticket/10174 Signed-off-by: Chris Ball <cjb@laptop.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
| * | HID: picolcd: correct ordering of framebuffer freeingBruno Prémont2010-08-061-1/+1
| | | | | | | | | | | | | | | | | | | | | Fix the free() ordering (which was never reached due to wrong check). Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
| * | HID: picolcd: testing the wrong variableDan Carpenter2010-08-061-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | "ref_cnt" is a point to the reference count and it's non-null. We really want to test the reference count itself. Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | | Merge branch 'release' of ↵Linus Torvalds2010-08-181-2/+0
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 * 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6: [IA64] Fix build error: conflicting types for ‘sys_execve’
| * | | [IA64] Fix build error: conflicting types for ‘sys_execve’Tony Luck2010-08-181-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | arch/ia64/kernel/process.c:636: error: conflicting types for ‘sys_execve’ commit d7627467b7a8dd6944885290a03a07ceb28c10eb Make do_execve() take a const filename pointer Missed the declaration of sys_execve in the ia64 asm/unistd.h (perhaps because there is no reason for it to be there ... it might be a left over from the COMPAT code?). Just delete the conflicting version. Signed-off-by: Tony Luck <tony.luck@intel.com>
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