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locking/lockdep: Untangle xhlock history save/restore from task independence

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Where XHLOCK_{SOFT,HARD} are save/restore points in the xhlocks[] to
ensure the temporal IRQ events don't interact with task state, the
XHLOCK_PROC is a fundament different beast that just happens to share
the interface.

The purpose of XHLOCK_PROC is to annotate independent execution inside
one task. For example workqueues, each work should appear to run in its
own 'pristine' 'task'.

Remove XHLOCK_PROC in favour of its own interface to avoid confusion.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Byungchul Park <byungchul.park@lge.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: boqun.feng@gmail.com
Cc: david@fromorbit.com
Cc: johannes@sipsolutions.net
Cc: kernel-team@lge.com
Cc: oleg@redhat.com
Cc: tj@kernel.org
Link: http://lkml.kernel.org/r/20170829085939.ggmb6xiohw67micb@hirez.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2017-08-29 10:59:39 +02:00 • committed by Ingo Molnar
parent 7b3d61cc73
commit f52be57080
4 changed files with 48 additions and 51 deletions
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4
include/linux/irqflags.h
View file

@ -26,7 +26,7 @@
# define trace_hardirq_enter() \
do { \
current->hardirq_context++; \
crossrelease_hist_start(XHLOCK_HARD, 0);\
crossrelease_hist_start(XHLOCK_HARD); \
} while (0)
# define trace_hardirq_exit() \
do { \
@ -36,7 +36,7 @@ do { \
# define lockdep_softirq_enter() \
do { \
current->softirq_context++; \
crossrelease_hist_start(XHLOCK_SOFT, 0);\
crossrelease_hist_start(XHLOCK_SOFT); \
} while (0)
# define lockdep_softirq_exit() \
do { \