From 4db0c3c2983cc6b7a08a33542af5e14de8a9258c Mon Sep 17 00:00:00 2001 From: Jason Low Date: Wed, 15 Apr 2015 16:14:08 -0700 Subject: 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 Acked-by: Michal Hocko Acked-by: Davidlohr Bueso Acked-by: Rik van Riel Reviewed-by: Christian Borntraeger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/rmap.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'mm/rmap.c') 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 -- cgit v1.2.3