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mm: remove cgroup_mm_owner_callbacks

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cgroup_mm_owner_callbacks() was brought in to support the memrlimit
controller, but sneaked into mainline ahead of it.  That controller has
now been shelved, and the mm_owner_changed() args were inadequate for it
anyway (they needed an mm pointer instead of a task pointer).

Remove the dead code, and restore mm_update_next_owner() locking to how it
was before: taking mmap_sem there does nothing for memcontrol.c, now the
only user of mm->owner.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: Paul Menage <menage@google.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins
2009-01-06 14:39:22 -08:00
committed by Linus Torvalds
parent 39f0dee2d8
commit e5991371ee
3 changed files with 7 additions and 56 deletions
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14
include/linux/cgroup.h
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@@ -329,13 +329,7 @@ struct cgroup_subsys {
struct cgroup *cgrp);
void (*post_clone)(struct cgroup_subsys *ss, struct cgroup *cgrp);
void (*bind)(struct cgroup_subsys *ss, struct cgroup *root);
/*
* This routine is called with the task_lock of mm->owner held
*/
void (*mm_owner_changed)(struct cgroup_subsys *ss,
struct cgroup *old,
struct cgroup *new,
struct task_struct *p);
int subsys_id;
int active;
int disabled;
@@ -400,9 +394,6 @@ void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it);
int cgroup_scan_tasks(struct cgroup_scanner *scan);
int cgroup_attach_task(struct cgroup *, struct task_struct *);
void cgroup_mm_owner_callbacks(struct task_struct *old,
struct task_struct *new);
#else /* !CONFIG_CGROUPS */
static inline int cgroup_init_early(void) { return 0; }
@@ -420,9 +411,6 @@ static inline int cgroupstats_build(struct cgroupstats *stats,
return -EINVAL;
}
static inline void cgroup_mm_owner_callbacks(struct task_struct *old,
struct task_struct *new) {}
#endif /* !CONFIG_CGROUPS */
#endif /* _LINUX_CGROUP_H */