lkml.org 
[lkml]   [2024]   [Apr]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/4] memcg: use proper type for mod_memcg_state
Date
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.

Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>
---
include/linux/memcontrol.h | 13 +++++++------
mm/memcontrol.c | 3 ++-
2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index d68db7a0e829..1b4a6201c78c 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -991,7 +991,8 @@ 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)
@@ -1012,7 +1013,7 @@ 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;

@@ -1022,7 +1023,7 @@ 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;

@@ -1541,19 +1542,19 @@ 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)
{
}

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index bb1bbf417a46..4e991e913393 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -816,7 +816,8 @@ 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)
{
if (mem_cgroup_disabled())
return;
--
2.43.0

\
 
 \ /
  Last update: 2024-04-23 07:22    [W:0.094 / U:0.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site