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Subject[RFC][PATCH -mmotm 2/4] memcg: remove mem_cgroup_try_charge
Now, mem_cgroup_try_charge is not used by anyone, so we can remove it.

Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
---
include/linux/memcontrol.h | 8 --------
mm/memcontrol.c | 21 +--------------------
2 files changed, 1 insertions(+), 28 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index fe82b58..4b35739 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -40,8 +40,6 @@ struct mm_struct;
extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask);
/* for swap handling */
-extern int mem_cgroup_try_charge(struct mm_struct *mm,
- gfp_t gfp_mask, struct mem_cgroup **ptr);
extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
struct page *page, gfp_t mask, struct mem_cgroup **ptr);
extern void mem_cgroup_commit_charge_swapin(struct page *page,
@@ -135,12 +133,6 @@ static inline int mem_cgroup_cache_charge(struct page *page,
return 0;
}

-static inline int mem_cgroup_try_charge(struct mm_struct *mm,
- gfp_t gfp_mask, struct mem_cgroup **ptr)
-{
- return 0;
-}
-
static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
{
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 50ee1be..9c5856b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -808,27 +808,8 @@ nomem:
return -ENOMEM;
}

-/**
- * mem_cgroup_try_charge - get charge of PAGE_SIZE.
- * @mm: an mm_struct which is charged against. (when *memcg is NULL)
- * @gfp_mask: gfp_mask for reclaim.
- * @memcg: a pointer to memory cgroup which is charged against.
- *
- * charge against memory cgroup pointed by *memcg. if *memcg == NULL, estimated
- * memory cgroup from @mm is got and stored in *memcg.
- *
- * Returns 0 if success. -ENOMEM at failure.
- * This call can invoke OOM-Killer.
- */
-
-int mem_cgroup_try_charge(struct mm_struct *mm,
- gfp_t mask, struct mem_cgroup **memcg)
-{
- return __mem_cgroup_try_charge(mm, mask, memcg, true);
-}
-
/*
- * commit a charge got by mem_cgroup_try_charge() and makes page_cgroup to be
+ * commit a charge got by __mem_cgroup_try_charge() and makes page_cgroup to be
* USED state. If already USED, uncharge and return.
*/


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