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Revert "sched: improve preempt debugging" 

This reverts commit 7317d7b87e.

This has been reported (and bisected) by Alexey Zaytsev and
Kamalesh Babulal to produce annoying warnings during bootup
on both x86 and powerpc.

kernel_locked() is not a valid test in IRQ context (we update the
BKL's ->lock_depth and the preempt count separately and non-atomicalyy),
so we cannot put it into the generic preempt debugging checks which
can run in IRQ contexts too.

Reported-and-bisected-by: Alexey Zaytsev <alexey.zaytsev@gmail.com>
Reported-and-bisected-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-01-12 13:00:50 +01:00
parent fd2ab30b65
commit 01e3eb8227
1 changed files with 1 additions and 1 deletions
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2
kernel/sched.c
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@ -4440,7 +4440,7 @@ void __kprobes sub_preempt_count(int val)
/*
* Underflow?
*/
if (DEBUG_LOCKS_WARN_ON(val > preempt_count() - (!!kernel_locked())))
if (DEBUG_LOCKS_WARN_ON(val > preempt_count()))
return;
/*
* Is the spinlock portion underflowing?