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| author | Peter Zijlstra <peterz@infradead.org> | 2014-03-12 13:24:42 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-03-12 13:49:47 +0100 |
| commit | 6f008e72cd111a119b5d8de8c5438d892aae99eb (patch) | |
| tree | d00f4254e5ae2a3def0a70ab15d7a8794fc6d6a1 /init | |
| parent | locking/mutexes: Add extra reschedule point (diff) | |
| download | linux-6f008e72cd111a119b5d8de8c5438d892aae99eb.tar.xz linux-6f008e72cd111a119b5d8de8c5438d892aae99eb.zip | |
locking/mutex: Fix debug checks
OK, so commit:
1d8fe7dc8078 ("locking/mutexes: Unlock the mutex without the wait_lock")
generates this boot warning when CONFIG_DEBUG_MUTEXES=y:
WARNING: CPU: 0 PID: 139 at /usr/src/linux-2.6/kernel/locking/mutex-debug.c:82 debug_mutex_unlock+0x155/0x180() DEBUG_LOCKS_WARN_ON(lock->owner != current)
And that makes sense, because as soon as we release the lock a
new owner can come in...
One would think that !__mutex_slowpath_needs_to_unlock()
implementations suffer the same, but for DEBUG we fall back to
mutex-null.h which has an unconditional 1 for that.
The mutex debug code requires the mutex to be unlocked after
doing the debug checks, otherwise it can find inconsistent
state.
Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: jason.low2@hp.com
Link: http://lkml.kernel.org/r/20140312122442.GB27965@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'init')
0 files changed, 0 insertions, 0 deletions