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highmem: Fix race in debug_kmap_atomic() which could cause warn_count to underflow

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debug_kmap_atomic() tries to prevent ever printing more than 10
warnings, but it does so by testing whether an unsigned integer
is equal to 0. However, if the warning is caused by a nested
IRQ, then this counter may underflow and the stream of warnings
will never end.

Fix that by using a signed integer instead.

Signed-off-by: Soeren Sandmann Pedersen <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: [email protected]
Cc: <[email protected]> # .31.x
LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Soeren Sandmann 2009-10-28 18:55:36 +01:00 • committed by Ingo Molnar
commit 5ebd4c2289
1 changed files with 2 additions and 2 deletions
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4
mm/highmem.c
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@ -426,9 +426,9 @@ void __init page_address_init(void)
void debug_kmap_atomic(enum km_type type)
{
static unsigned warn_count = 10;
static int warn_count = 10;
if (unlikely(warn_count == 0))
if (unlikely(warn_count < 0))
return;
if (unlikely(in_interrupt())) {