preempt: Use preempt_schedule_context() as the official tracing preemption point
authorFrederic Weisbecker <fweisbec@gmail.com>
Thu, 4 Jun 2015 15:39:08 +0000 (17:39 +0200)
committerIngo Molnar <mingo@kernel.org>
Sun, 7 Jun 2015 13:57:42 +0000 (15:57 +0200)
commit4eaca0a887eaee04fc7a3866d0f5b51b34030dfa
tree82ebaa639373c69aad063040cb87228fe5a0645c
parentbe690035df893385ceaac2323b29be1fb7f2a67f
preempt: Use preempt_schedule_context() as the official tracing preemption point

preempt_schedule_context() is a tracing safe preemption point but it's
only used when CONFIG_CONTEXT_TRACKING=y. Other configs have tracing
recursion issues since commit:

  b30f0e3ffedf ("sched/preempt: Optimize preemption operations on __schedule() callers")

introduced function based preemp_count_*() ops.

Lets make it available on all configs and give it a more appropriate
name for its new position.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1433432349-1021-3-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/include/asm/preempt.h
arch/x86/kernel/i386_ksyms_32.c
arch/x86/kernel/x8664_ksyms_64.c
arch/x86/lib/thunk_32.S
arch/x86/lib/thunk_64.S
include/asm-generic/preempt.h
include/linux/preempt.h
kernel/sched/core.c