4 files changed, 11 insertions, 123 deletions
diff --git a/Documentation/RCU/checklist.txt b/Documentation/RCU/checklist.txt
index 79e789b8b8ea..7703ec73a9bb 100644
--- a/Documentation/RCU/checklist.txt
+++ b/Documentation/RCU/checklist.txt
@@ -354,12 +354,6 @@ over a rather long period of time, but improvements are always welcome!
 	using RCU rather than SRCU, because RCU is almost always faster
 	and easier to use than is SRCU.
 
-	If you need to enter your read-side critical section in a
-	hardirq or exception handler, and then exit that same read-side
-	critical section in the task that was interrupted, then you need
-	to srcu_read_lock_raw() and srcu_read_unlock_raw(), which avoid
-	the lockdep checking that would otherwise this practice illegal.
-
 	Also unlike other forms of RCU, explicit initialization
 	and cleanup is required via init_srcu_struct() and
 	cleanup_srcu_struct().	These are passed a "struct srcu_struct"
diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt
index 7dce8a17eac2..d8a502387397 100644
--- a/Documentation/RCU/torture.txt
+++ b/Documentation/RCU/torture.txt
@@ -182,12 +182,6 @@ torture_type	The type of RCU to test, with string values as follows:
 		"srcu_expedited": srcu_read_lock(), srcu_read_unlock() and
 			synchronize_srcu_expedited().
 
-		"srcu_raw": srcu_read_lock_raw(), srcu_read_unlock_raw(),
-			and call_srcu().
-
-		"srcu_raw_sync": srcu_read_lock_raw(), srcu_read_unlock_raw(),
-			and synchronize_srcu().
-
 		"sched": preempt_disable(), preempt_enable(), and
 			call_rcu_sched().
 
diff --git a/Documentation/RCU/trace.txt b/Documentation/RCU/trace.txt
index c776968f4463..f3778f8952da 100644
--- a/Documentation/RCU/trace.txt
+++ b/Documentation/RCU/trace.txt
@@ -530,113 +530,21 @@ o	"nos" counts the number of times we balked for other
 	reasons, e.g., the grace period ended first.
 
 
-CONFIG_TINY_RCU and CONFIG_TINY_PREEMPT_RCU debugfs Files and Formats
+CONFIG_TINY_RCU debugfs Files and Formats
 
 These implementations of RCU provides a single debugfs file under the
 top-level directory RCU, namely rcu/rcudata, which displays fields in
-rcu_bh_ctrlblk, rcu_sched_ctrlblk and, for CONFIG_TINY_PREEMPT_RCU,
-rcu_preempt_ctrlblk.
+rcu_bh_ctrlblk and rcu_sched_ctrlblk.
 
 The output of "cat rcu/rcudata" is as follows:
 
-rcu_preempt: qlen=24 gp=1097669 g197/p197/c197 tasks=...
-             ttb=. btg=no ntb=184 neb=0 nnb=183 j=01f7 bt=0274
-             normal balk: nt=1097669 gt=0 bt=371 b=0 ny=25073378 nos=0
-             exp balk: bt=0 nos=0
 rcu_sched: qlen: 0
 rcu_bh: qlen: 0
 
-This is split into rcu_preempt, rcu_sched, and rcu_bh sections, with the
-rcu_preempt section appearing only in CONFIG_TINY_PREEMPT_RCU builds.
-The last three lines of the rcu_preempt section appear only in
-CONFIG_RCU_BOOST kernel builds.  The fields are as follows:
+This is split into rcu_sched and rcu_bh sections.  The field is as
+follows:
 
 o	"qlen" is the number of RCU callbacks currently waiting either
 	for an RCU grace period or waiting to be invoked.  This is the
 	only field present for rcu_sched and rcu_bh, due to the
 	short-circuiting of grace period in those two cases.
-
-o	"gp" is the number of grace periods that have completed.
-
-o	"g197/p197/c197" displays the grace-period state, with the
-	"g" number being the number of grace periods that have started
-	(mod 256), the "p" number being the number of grace periods
-	that the CPU has responded to (also mod 256), and the "c"
-	number being the number of grace periods that have completed
-	(once again mode 256).
-
-	Why have both "gp" and "g"?  Because the data flowing into
-	"gp" is only present in a CONFIG_RCU_TRACE kernel.
-
-o	"tasks" is a set of bits.  The first bit is "T" if there are
-	currently tasks that have recently blocked within an RCU
-	read-side critical section, the second bit is "N" if any of the
-	aforementioned tasks are blocking the current RCU grace period,
-	and the third bit is "E" if any of the aforementioned tasks are
-	blocking the current expedited grace period.  Each bit is "."
-	if the corresponding condition does not hold.
-
-o	"ttb" is a single bit.  It is "B" if any of the blocked tasks
-	need to be priority boosted and "." otherwise.
-
-o	"btg" indicates whether boosting has been carried out during
-	the current grace period, with "exp" indicating that boosting
-	is in progress for an expedited grace period, "no" indicating
-	that boosting has not yet started for a normal grace period,
-	"begun" indicating that boosting has bebug for a normal grace
-	period, and "done" indicating that boosting has completed for
-	a normal grace period.
-
-o	"ntb" is the total number of tasks subjected to RCU priority boosting
-	periods since boot.
-
-o	"neb" is the number of expedited grace periods that have had
-	to resort to RCU priority boosting since boot.
-
-o	"nnb" is the number of normal grace periods that have had
-	to resort to RCU priority boosting since boot.
-
-o	"j" is the low-order 16 bits of the jiffies counter in hexadecimal.
-
-o	"bt" is the low-order 16 bits of the value that the jiffies counter
-	will have at the next time that boosting is scheduled to begin.
-
-o	In the line beginning with "normal balk", the fields are as follows:
-
-	o	"nt" is the number of times that the system balked from
-		boosting because there were no blocked tasks to boost.
-		Note that the system will balk from boosting even if the
-		grace period is overdue when the currently running task
-		is looping within an RCU read-side critical section.
-		There is no point in boosting in this case, because
-		boosting a running task won't make it run any faster.
-
-	o	"gt" is the number of times that the system balked
-		from boosting because, although there were blocked tasks,
-		none of them were preventing the current grace period
-		from completing.
-
-	o	"bt" is the number of times that the system balked
-		from boosting because boosting was already in progress.
-
-	o	"b" is the number of times that the system balked from
-		boosting because boosting had already completed for
-		the grace period in question.
-
-	o	"ny" is the number of times that the system balked from
-		boosting because it was not yet time to start boosting
-		the grace period in question.
-
-	o	"nos" is the number of times that the system balked from
-		boosting for inexplicable ("not otherwise specified")
-		reasons.  This can actually happen due to races involving
-		increments of the jiffies counter.
-
-o	In the line beginning with "exp balk", the fields are as follows:
-
-	o	"bt" is the number of times that the system balked from
-		boosting because there were no blocked tasks to boost.
-
-	o	"nos" is the number of times that the system balked from
-		 boosting for inexplicable ("not otherwise specified")
-		 reasons.
diff --git a/Documentation/RCU/whatisRCU.txt b/Documentation/RCU/whatisRCU.txt
index 10df0b82f459..0f0fb7c432c2 100644
--- a/Documentation/RCU/whatisRCU.txt
+++ b/Documentation/RCU/whatisRCU.txt
@@ -842,9 +842,7 @@ SRCU:	Critical sections	Grace period		Barrier
 
 	srcu_read_lock		synchronize_srcu	srcu_barrier
 	srcu_read_unlock	call_srcu
-	srcu_read_lock_raw	synchronize_srcu_expedited
-	srcu_read_unlock_raw
-	srcu_dereference
+	srcu_dereference	synchronize_srcu_expedited
 
 SRCU:	Initialization/cleanup
 	init_srcu_struct
@@ -865,38 +863,32 @@ list can be helpful:
 
 a.	Will readers need to block?  If so, you need SRCU.
 
-b.	Is it necessary to start a read-side critical section in a
-	hardirq handler or exception handler, and then to complete
-	this read-side critical section in the task that was
-	interrupted?  If so, you need SRCU's srcu_read_lock_raw() and
-	srcu_read_unlock_raw() primitives.
-
-c.	What about the -rt patchset?  If readers would need to block
+b.	What about the -rt patchset?  If readers would need to block
 	in an non-rt kernel, you need SRCU.  If readers would block
 	in a -rt kernel, but not in a non-rt kernel, SRCU is not
 	necessary.
 
-d.	Do you need to treat NMI handlers, hardirq handlers,
+c.	Do you need to treat NMI handlers, hardirq handlers,
 	and code segments with preemption disabled (whether
 	via preempt_disable(), local_irq_save(), local_bh_disable(),
 	or some other mechanism) as if they were explicit RCU readers?
 	If so, RCU-sched is the only choice that will work for you.
 
-e.	Do you need RCU grace periods to complete even in the face
+d.	Do you need RCU grace periods to complete even in the face
 	of softirq monopolization of one or more of the CPUs?  For
 	example, is your code subject to network-based denial-of-service
 	attacks?  If so, you need RCU-bh.
 
-f.	Is your workload too update-intensive for normal use of
+e.	Is your workload too update-intensive for normal use of
 	RCU, but inappropriate for other synchronization mechanisms?
 	If so, consider SLAB_DESTROY_BY_RCU.  But please be careful!
 
-g.	Do you need read-side critical sections that are respected
+f.	Do you need read-side critical sections that are respected
 	even though they are in the middle of the idle loop, during
 	user-mode execution, or on an offlined CPU?  If so, SRCU is the
 	only choice that will work for you.
 
-h.	Otherwise, use RCU.
+g.	Otherwise, use RCU.
 
 Of course, this all assumes that you have determined that RCU is in fact
 the right tool for your job.