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authorLorenzo Stoakes <lstoakes@gmail.com>2016-10-13 01:20:13 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-18 14:13:37 -0700
commitc164154f66f0c9b02673f07aa4f044f1d9c70274 (patch)
treefdfdc521c7cadcbbd8b4bb6bd85e8b17c13fcb13 /mm/gup.c
parentd4944b0ecec0af882483fe44b66729316e575208 (diff)
downloadlinux-c164154f66f0c9b02673f07aa4f044f1d9c70274.tar.bz2
mm: replace get_user_pages_unlocked() write/force parameters with gup_flags
This removes the 'write' and 'force' use from get_user_pages_unlocked() and replaces them with 'gup_flags' to make the use of FOLL_FORCE explicit in callers as use of this flag can result in surprising behaviour (and hence bugs) within the mm subsystem. Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com> Reviewed-by: Jan Kara <jack@suse.cz> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/gup.c')
-rw-r--r--mm/gup.c14
1 files changed, 4 insertions, 10 deletions
diff --git a/mm/gup.c b/mm/gup.c
index e997f545b059..373d1ec006e4 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -907,17 +907,10 @@ EXPORT_SYMBOL(__get_user_pages_unlocked);
* "force" parameter).
*/
long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages,
- int write, int force, struct page **pages)
+ struct page **pages, unsigned int gup_flags)
{
- unsigned int flags = FOLL_TOUCH;
-
- if (write)
- flags |= FOLL_WRITE;
- if (force)
- flags |= FOLL_FORCE;
-
return __get_user_pages_unlocked(current, current->mm, start, nr_pages,
- pages, flags);
+ pages, gup_flags | FOLL_TOUCH);
}
EXPORT_SYMBOL(get_user_pages_unlocked);
@@ -1535,7 +1528,8 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
start += nr << PAGE_SHIFT;
pages += nr;
- ret = get_user_pages_unlocked(start, nr_pages - nr, write, 0, pages);
+ ret = get_user_pages_unlocked(start, nr_pages - nr, pages,
+ write ? FOLL_WRITE : 0);
/* Have to be a bit careful with return values */
if (nr > 0) {