diff options
| author | David Howells <dhowells@redhat.com> | 2010-01-16 02:01:33 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-01-16 21:15:40 +0100 |
| commit | 1e2ae599d37e60958c03ca5e46b1f657619a30cd (patch) | |
| tree | 0a0c9ff0370fbefd4eb8fe3a44106880c1aae8cb /include | |
| parent | nommu: fix SYSV SHM for NOMMU (diff) | |
| download | linux-1e2ae599d37e60958c03ca5e46b1f657619a30cd.tar.xz linux-1e2ae599d37e60958c03ca5e46b1f657619a30cd.zip | |
nommu: struct vm_region's vm_usage count need not be atomic
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mm_types.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 84d020bed083..80cfa78a8cf6 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -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 */ }; |