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nommu: struct vm_region's vm_usage count need not be atomic

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The vm_usage count field in struct vm_region does not need to be atomic as
it's only even modified whilst nommu_region_sem is write locked.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Greg Ungerer <gerg@snapgear.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells 2010-01-15 17:01:33 -08:00 • committed by Linus Torvalds
parent ed5e5894b2
commit 1e2ae599d3
2 changed files with 8 additions and 8 deletions
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2
include/linux/mm_types.h
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@ -122,7 +122,7 @@ struct vm_region {
unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */
struct file *vm_file; /* the backing file or NULL */
atomic_t vm_usage; /* region usage count */
int vm_usage; /* region usage count (access under nommu_region_sem) */
bool vm_icache_flushed : 1; /* true if the icache has been flushed for
* this region */
};