mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 00:48:50 +00:00
bcb38ceb22
This reverts commit e0fdace10e.
On-list discussion seems to suggest that the robustness fixes for printk
make this unnecessary and DaveM has also agreed in person at Kernel Summit
and on list.
The main problem with this code is once we hit a lockdep splat we always
keep oops_in_progress set, the console layer uses oops_in_progress with KMS
to decide when it should be showing the oops and not showing X, so it causes
problems around suspend/resume time when a userspace resume can cause a console
switch away from X, only if oops_in_progress is set (which is what we want
if an oops actually is in progress, but not because we had a lockdep splat
2 days prior).
Cc: David S Miller <davem@davemloft.net>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
46 lines
1.1 KiB
C
46 lines
1.1 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/module.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 = 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;
|
|
|
|
/*
|
|
* Generic 'turn off all lock debugging' function:
|
|
*/
|
|
int debug_locks_off(void)
|
|
{
|
|
if (__debug_locks_off()) {
|
|
if (!debug_locks_silent) {
|
|
console_verbose();
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|