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sched: Get rid of lock_depth

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Neil Brown pointed out that lock_depth somehow escaped the BKL
removal work.  Let's get rid of it now.

Note that the perf scripting utilities still have a bunch of
code for dealing with common_lock_depth in tracepoints; I have
left that in place in case anybody wants to use that code with
older kernels.

Suggested-by: Neil Brown <neilb@suse.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20110422111910.456c0e84@bike.lwn.net
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jonathan Corbet 2011-04-22 11:19:10 -06:00 • committed by Ingo Molnar
parent d3bf52e998
commit 625f2a378e
10 changed files with 1 additions and 33 deletions
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7
kernel/mutex.c
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@ -162,13 +162,6 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
for (;;) {
struct task_struct *owner;
/*
* If we own the BKL, then don't spin. The owner of
* the mutex might be waiting on us to release the BKL.
*/
if (unlikely(current->lock_depth >= 0))
break;
/*
* If there's an owner, wait for it to either
* release the lock or go to sleep.