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highmem: Fix race in debug_kmap_atomic() which could cause warn_count to underflow
[firefly-linux-kernel-4.4.55.git]
/
mm
/
highmem.c
diff --git
a/mm/highmem.c
b/mm/highmem.c
index 25878cc49daa268806f46dfa4e05af8d6f8f3998..33587de6b8715cad25ee17254e1b82a4fa3454a3 100644
(file)
--- a/
mm/highmem.c
+++ b/
mm/highmem.c
@@
-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())) {