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x86: add might_sleep() to do_page_fault()

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Impact: widen debug checks

VirtualBox calls do_page_fault() from an atomic context but runs into a
might_sleep() way pas this point, cure that.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-01-29 16:02:12 +01:00 committed by Ingo Molnar
parent fb746d0e13
commit 010060741a
1 changed files with 6 additions and 0 deletions
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6
arch/x86/mm/fault.c
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@ -888,6 +888,12 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code)
return;
}
down_read(&mm->mmap_sem);
} else {
/*
* The above down_read_trylock() might have succeeded in which
* case we'll have missed the might_sleep() from down_read().
*/
might_sleep();
}
vma = find_vma(mm, address);