The patch titled
Subject: mm: BUG when __kmap_atomic_idx equals KM_TYPE_NR
has been added to the -mm tree. Its filename is
mm-bug-when-__kmap_atomic_idx-equals-km_type_nr.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-bug-when-__kmap_atomic_idx-equals-km_type_nr.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-bug-when-__kmap_atomic_idx-equals-km_type_nr.patch
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------------------------------------------------------
From: Chintan Pandya <cpandya@xxxxxxxxxxxxxx>
Subject: mm: BUG when __kmap_atomic_idx equals KM_TYPE_NR
__kmap_atomic_idx is per_cpu variable. Each CPU can use KM_TYPE_NR
entries from FIXMAP i.e. from 0 to KM_TYPE_NR - 1. Allowing
__kmap_atomic_idx to over- shoot to KM_TYPE_NR can mess up with next CPU's
0th entry which is a bug. Hence BUG_ON if __kmap_atomic_idx >=
KM_TYPE_NR.
Fix the off-by-on in this test.
Signed-off-by: Chintan Pandya <cpandya@xxxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/highmem.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN include/linux/highmem.h~mm-bug-when-__kmap_atomic_idx-equals-km_type_nr include/linux/highmem.h
--- a/include/linux/highmem.h~mm-bug-when-__kmap_atomic_idx-equals-km_type_nr
+++ a/include/linux/highmem.h
@@ -93,7 +93,7 @@ static inline int kmap_atomic_idx_push(v
#ifdef CONFIG_DEBUG_HIGHMEM
WARN_ON_ONCE(in_irq() && !irqs_disabled());
- BUG_ON(idx > KM_TYPE_NR);
+ BUG_ON(idx >= KM_TYPE_NR);
#endif
return idx;
}
_
Patches currently in -mm which might be from cpandya@xxxxxxxxxxxxxx are
mm-bug-when-__kmap_atomic_idx-equals-km_type_nr.patch
timer-provide-an-api-for-deferrable-timeout.patch
ksm-provide-support-to-use-deferrable-timers-for-scanner-thread.patch
ksm-provide-support-to-use-deferrable-timers-for-scanner-thread-fix.patch
ksm-provide-support-to-use-deferrable-timers-for-scanner-thread-fix-fix-2.patch
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