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authorJohannes Weiner <hannes@cmpxchg.org>2015-11-06 05:50:26 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-06 06:34:48 +0300
commit6071ca5201066f4b2a61cfb693dd186d6bc6e9f3 (patch)
tree2ec2fa58fc43986025267568feb96c7b86a2722c /mm/page_counter.c
parentf5fc3c5d817435970aa301d066820a9ac12c8120 (diff)
downloadlinux-6071ca5201066f4b2a61cfb693dd186d6bc6e9f3.tar.xz
mm: page_counter: let page_counter_try_charge() return bool
page_counter_try_charge() currently returns 0 on success and -ENOMEM on failure, which is surprising behavior given the function name. Make it follow the expected pattern of try_stuff() functions that return a boolean true to indicate success, or false for failure. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Vladimir Davydov <vdavydov@virtuozzo.com Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_counter.c')
-rw-r--r--mm/page_counter.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/mm/page_counter.c b/mm/page_counter.c
index 11b4beda14ba..7c6a63d2c27f 100644
--- a/mm/page_counter.c
+++ b/mm/page_counter.c
@@ -56,12 +56,12 @@ void page_counter_charge(struct page_counter *counter, unsigned long nr_pages)
* @nr_pages: number of pages to charge
* @fail: points first counter to hit its limit, if any
*
- * Returns 0 on success, or -ENOMEM and @fail if the counter or one of
- * its ancestors has hit its configured limit.
+ * Returns %true on success, or %false and @fail if the counter or one
+ * of its ancestors has hit its configured limit.
*/
-int page_counter_try_charge(struct page_counter *counter,
- unsigned long nr_pages,
- struct page_counter **fail)
+bool page_counter_try_charge(struct page_counter *counter,
+ unsigned long nr_pages,
+ struct page_counter **fail)
{
struct page_counter *c;
@@ -99,13 +99,13 @@ int page_counter_try_charge(struct page_counter *counter,
if (new > c->watermark)
c->watermark = new;
}
- return 0;
+ return true;
failed:
for (c = counter; c != *fail; c = c->parent)
page_counter_cancel(c, nr_pages);
- return -ENOMEM;
+ return false;
}
/**