mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 10:45:09 +07:00
01a14bda11
Make the frequently used lockdep global variable debug_locks read-mostly. As debug_locks_silent is sometime used together with debug_locks, it is also made read-mostly so that they can be close together. With false cacheline sharing, cacheline contention problem can happen depending on what get put into the same cacheline as debug_locks. Signed-off-by: Waiman Long <longman@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Link: http://lkml.kernel.org/r/1539913518-15598-2-git-send-email-longman@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
/*
|
|
* lib/debug_locks.c
|
|
*
|
|
* Generic place for common debugging facilities for various locks:
|
|
* spinlocks, rwlocks, mutexes and rwsems.
|
|
*
|
|
* Started by Ingo Molnar:
|
|
*
|
|
* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
|
|
*/
|
|
#include <linux/rwsem.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/export.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/debug_locks.h>
|
|
|
|
/*
|
|
* We want to turn all lock-debugging facilities on/off at once,
|
|
* via a global flag. The reason is that once a single bug has been
|
|
* detected and reported, there might be cascade of followup bugs
|
|
* that would just muddy the log. So we report the first one and
|
|
* shut up after that.
|
|
*/
|
|
int debug_locks __read_mostly = 1;
|
|
EXPORT_SYMBOL_GPL(debug_locks);
|
|
|
|
/*
|
|
* The locking-testsuite uses <debug_locks_silent> to get a
|
|
* 'silent failure': nothing is printed to the console when
|
|
* a locking bug is detected.
|
|
*/
|
|
int debug_locks_silent __read_mostly;
|
|
EXPORT_SYMBOL_GPL(debug_locks_silent);
|
|
|
|
/*
|
|
* Generic 'turn off all lock debugging' function:
|
|
*/
|
|
int debug_locks_off(void)
|
|
{
|
|
if (debug_locks && __debug_locks_off()) {
|
|
if (!debug_locks_silent) {
|
|
console_verbose();
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(debug_locks_off);
|