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memcg: use proper type for mod_memcg_state

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The memcg stats update functions can take arbitrary integer but the only
input which make sense is enum memcg_stat_item and we don't want these
functions to be called with arbitrary integer, so replace the parameter
type with enum memcg_stat_item and compiler will be able to warn if memcg
stat update functions are called with incorrect index value.

Link: https://lkml.kernel.org/r/20240501172617.678560-9-shakeel.butt@linux.dev
Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>
Reviewed-by: T.J. Mercier <tjmercier@google.com>
Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Shakeel Butt 2024-05-01 10:26:17 -07:00 committed by Andrew Morton
parent acb5fe2f1a
commit a94032b35e
2 changed files with 9 additions and 7 deletions
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13
include/linux/memcontrol.h
View file

@ -974,7 +974,8 @@ void mem_cgroup_print_oom_group(struct mem_cgroup *memcg);
void folio_memcg_lock(struct folio *folio);
void folio_memcg_unlock(struct folio *folio);
void __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val);
void __mod_memcg_state(struct mem_cgroup *memcg, enum memcg_stat_item idx,
int val);
/* try to stablize folio_memcg() for all the pages in a memcg */
static inline bool mem_cgroup_trylock_pages(struct mem_cgroup *memcg)
@ -995,7 +996,7 @@ static inline void mem_cgroup_unlock_pages(void)
/* idx can be of type enum memcg_stat_item or node_stat_item */
static inline void mod_memcg_state(struct mem_cgroup *memcg,
int idx, int val)
enum memcg_stat_item idx, int val)
{
unsigned long flags;
@ -1005,7 +1006,7 @@ static inline void mod_memcg_state(struct mem_cgroup *memcg,
}
static inline void mod_memcg_page_state(struct page *page,
int idx, int val)
enum memcg_stat_item idx, int val)
{
struct mem_cgroup *memcg;
@ -1491,19 +1492,19 @@ static inline void mem_cgroup_print_oom_group(struct mem_cgroup *memcg)
}
static inline void __mod_memcg_state(struct mem_cgroup *memcg,
int idx,
enum memcg_stat_item idx,
int nr)
{
}
static inline void mod_memcg_state(struct mem_cgroup *memcg,
int idx,
enum memcg_stat_item idx,
int nr)
{
}
static inline void mod_memcg_page_state(struct page *page,
int idx, int val)
enum memcg_stat_item idx, int val)
{
}

3
mm/memcontrol.c
View file

@ -955,7 +955,8 @@ static int memcg_state_val_in_pages(int idx, int val)
* @idx: the stat item - can be enum memcg_stat_item or enum node_stat_item
* @val: delta to add to the counter, can be negative
*/
void __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val)
void __mod_memcg_state(struct mem_cgroup *memcg, enum memcg_stat_item idx,
int val)
{
int i = memcg_stats_index(idx);