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0e485a946a
1. introduce lock monitor 2. introduce spinlock debugging 3. introduce new lock dependency capture 4. enhance /proc/lockdep debug information MTK-Commit-Id: 8b5e506a5cd60ea3264f1adb480e0463088f91af Change-Id: I63fde6ba18f5c73d0ecaafa1bc9bb8f2a2e2fad1 CR-Id: ALPS04870405 Feature: [Module]Lockdep Signed-off-by: Kobe Wu <kobe-cp.wu@mediatek.com>
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/*
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* lib/debug_locks.c
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*
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* Generic place for common debugging facilities for various locks:
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* spinlocks, rwlocks, mutexes and rwsems.
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*
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* Started by Ingo Molnar:
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*
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* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
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*/
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#include <linux/rwsem.h>
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#include <linux/mutex.h>
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#include <linux/export.h>
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#include <linux/spinlock.h>
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#include <linux/debug_locks.h>
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#ifdef CONFIG_LOCKDEP
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#include <linux/sched/clock.h>
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unsigned long long debug_locks_off_ts;
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#endif
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/*
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* We want to turn all lock-debugging facilities on/off at once,
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* via a global flag. The reason is that once a single bug has been
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* detected and reported, there might be cascade of followup bugs
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* that would just muddy the log. So we report the first one and
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* shut up after that.
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*/
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int debug_locks = 1;
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EXPORT_SYMBOL_GPL(debug_locks);
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/*
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* The locking-testsuite uses <debug_locks_silent> to get a
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* 'silent failure': nothing is printed to the console when
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* a locking bug is detected.
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*/
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int debug_locks_silent;
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EXPORT_SYMBOL_GPL(debug_locks_silent);
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/*
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* Generic 'turn off all lock debugging' function:
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*/
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int debug_locks_off(void)
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{
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if (debug_locks && __debug_locks_off()) {
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#ifdef CONFIG_LOCKDEP
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debug_locks_off_ts = sched_clock();
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#endif
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if (!debug_locks_silent) {
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console_verbose();
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return 1;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(debug_locks_off);
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