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>
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 59b100f..d47de73 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2016,8 +2016,8 @@
return 0;
if (!do_swap_account ||
- !page_counter_try_charge(&memcg->memsw, batch, &counter)) {
- if (!page_counter_try_charge(&memcg->memory, batch, &counter))
+ page_counter_try_charge(&memcg->memsw, batch, &counter)) {
+ if (page_counter_try_charge(&memcg->memory, batch, &counter))
goto done_restock;
if (do_swap_account)
page_counter_uncharge(&memcg->memsw, batch);
@@ -2381,14 +2381,13 @@
{
unsigned int nr_pages = 1 << order;
struct page_counter *counter;
- int ret = 0;
+ int ret;
if (!memcg_kmem_is_active(memcg))
return 0;
- ret = page_counter_try_charge(&memcg->kmem, nr_pages, &counter);
- if (ret)
- return ret;
+ if (!page_counter_try_charge(&memcg->kmem, nr_pages, &counter))
+ return -ENOMEM;
ret = try_charge(memcg, gfp, nr_pages);
if (ret) {