Commit 5ebd4c22 authored by Soeren Sandmann's avatar Soeren Sandmann Committed by Ingo Molnar

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

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: default avatarSoeren Sandmann Pedersen <sandmann@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: a.p.zijlstra@chello.nl
Cc: <stable@kernel.org> # .31.x
LKML-Reference: <ye8zl7b8ktj.fsf@camel23.daimi.au.dk>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 83f5b01f
...@@ -426,9 +426,9 @@ void __init page_address_init(void) ...@@ -426,9 +426,9 @@ void __init page_address_init(void)
void debug_kmap_atomic(enum km_type type) 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; return;
if (unlikely(in_interrupt())) { if (unlikely(in_interrupt())) {
......
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