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| author | Jason Low <jason.low2@hp.com> | 2015-04-15 16:14:08 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-15 16:35:18 -0700 |
| commit | 4db0c3c2983cc6b7a08a33542af5e14de8a9258c (patch) | |
| tree | 66cfeaeae432f904c09af45e030b7e1e00476011 /mm/rmap.c | |
| parent | 9d8c47e4bb1c20dbceee437f9fa7d76dafee80a2 (diff) | |
| download | lwn-4db0c3c2983cc6b7a08a33542af5e14de8a9258c.tar.gz lwn-4db0c3c2983cc6b7a08a33542af5e14de8a9258c.zip | |
mm: remove rest of ACCESS_ONCE() usages
We converted some of the usages of ACCESS_ONCE to READ_ONCE in the mm/
tree since it doesn't work reliably on non-scalar types.
This patch removes the rest of the usages of ACCESS_ONCE, and use the new
READ_ONCE API for the read accesses. This makes things cleaner, instead
of using separate/multiple sets of APIs.
Signed-off-by: Jason Low <jason.low2@hp.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
Acked-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/rmap.c')
| -rw-r--r-- | mm/rmap.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index c161a14b6a8f..24dd3f9fee27 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -456,7 +456,7 @@ struct anon_vma *page_get_anon_vma(struct page *page) unsigned long anon_mapping; rcu_read_lock(); - anon_mapping = (unsigned long) ACCESS_ONCE(page->mapping); + anon_mapping = (unsigned long)READ_ONCE(page->mapping); if ((anon_mapping & PAGE_MAPPING_FLAGS) != PAGE_MAPPING_ANON) goto out; if (!page_mapped(page)) @@ -500,14 +500,14 @@ struct anon_vma *page_lock_anon_vma_read(struct page *page) unsigned long anon_mapping; rcu_read_lock(); - anon_mapping = (unsigned long) ACCESS_ONCE(page->mapping); + anon_mapping = (unsigned long)READ_ONCE(page->mapping); if ((anon_mapping & PAGE_MAPPING_FLAGS) != PAGE_MAPPING_ANON) goto out; if (!page_mapped(page)) goto out; anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON); - root_anon_vma = ACCESS_ONCE(anon_vma->root); + root_anon_vma = READ_ONCE(anon_vma->root); if (down_read_trylock(&root_anon_vma->rwsem)) { /* * If the page is still mapped, then this anon_vma is still |