linux-stable.git/Documentation/RCU, branch v3.19

Merge branches 'torture.2014.11.03a', 'cpu.2014.11.03a', 'doc.2014.11.13a', 'fixes.2014.11.13a', 'signal.2014.10.29a' and 'rt.2014.10.29a' into HEAD

2014-11-13T18:39:04+00:00

cpu.2014.11.03a: Changes for per-CPU variables.
doc.2014.11.13a: Documentation updates.
fixes.2014.11.13a: Miscellaneous fixes.
signal.2014.10.29a: Signal changes.
rt.2014.10.29a: Real-time changes.
torture.2014.11.03a: torture-test changes.

rcu: Remove redundant TREE_PREEMPT_RCU config option

2014-10-29T17:20:05+00:00

PREEMPT_RCU and TREE_PREEMPT_RCU serve the same function after
TINY_PREEMPT_RCU has been removed. This patch removes TREE_PREEMPT_RCU
and uses PREEMPT_RCU config option in its place.

Signed-off-by: Pranith Kumar 
Signed-off-by: Paul E. McKenney

rcu: Remove CONFIG_RCU_CPU_STALL_VERBOSE

2014-10-28T20:48:13+00:00

The CONFIG_RCU_CPU_STALL_VERBOSE Kconfig parameter causes preemptible
RCU's CPU stall warnings to dump out any preempted tasks that are blocking
the current RCU grace period.  This information is useful, and the default
has been CONFIG_RCU_CPU_STALL_VERBOSE=y for some years.  It is therefore
time for this commit to remove this Kconfig parameter, so that future
kernel builds will always act as if CONFIG_RCU_CPU_STALL_VERBOSE=y.

Signed-off-by: Paul E. McKenney

documentation: Add verbiage on RCU-tasks stall warning messages

2014-09-07T23:27:28+00:00

This commit documents RCU-tasks stall warning messages and also describes
when to use the new cond_resched_rcu_qs() API.

Signed-off-by: Paul E. McKenney

list: fix order of arguments for hlist_add_after(_rcu)

2014-08-07T01:01:24+00:00

All other add functions for lists have the new item as first argument
and the position where it is added as second argument.  This was changed
for no good reason in this function and makes using it unnecessary
confusing.

The name was changed to hlist_add_behind() to cause unconverted code to
generate a compile error instead of using the wrong parameter order.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Ken Helias 
Cc: "Paul E. McKenney" 
Acked-by: Jeff Kirsher 	[intel driver bits]
Cc: Hugh Dickins 
Cc: Christoph Hellwig 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

documentation: Add pointer to percpu-ref for RCU and refcount

2014-07-08T15:32:56+00:00

Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett 
Reviewed-by: Lai Jiangshan

documentation: Update reference, kerneltrap.org no longer works

2014-07-08T15:14:09+00:00

The kerneltrap.org site no longer works, so this commit updates it to
a working reference, namely gmane.

Signed-off-by: Pranith Kumar 
Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett

documentation: Update API documentation

2014-04-29T15:38:53+00:00

This commit updates the list of RCU API members in whatisRCU.txt.

Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett

documentation: Record rcu_dereference() value mishandling

2014-04-29T15:38:33+00:00

Recent LKML discussings (see http://lwn.net/Articles/586838/ and
http://lwn.net/Articles/588300/ for the LWN writeups) brought out
some ways of misusing the return value from rcu_dereference() that
are not necessarily completely intuitive.  This commit therefore
documents what can and cannot safely be done with these values.

Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett

documentation: Update sysfs path for rcu_cpu_stall_suppress

2014-04-29T15:21:50+00:00

Commit 6bfc09e2327d (rcu: Provide RCU CPU stall warnings for tiny RCU)
moved the rcu_cpu_stall_suppress module parameter from rcutree.c to
rcupdate.c, but failed to update Documentation/RCU/stallwarn.txt.  This
commit therefore repairs this omission.

Reported-by: Kirill Tkhai 
Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett