memcontrol: add vm_match_cgroup()

mm_cgroup() is exclusively used to test whether an mm's mem_cgroup pointer
is pointing to a specific cgroup.  Instead of returning the pointer, we can
just do the test itself in a new macro:

	vm_match_cgroup(mm, cgroup)

returns non-zero if the mm's mem_cgroup points to cgroup.  Otherwise it
returns zero.

Signed-off-by: David Rientjes <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Adrian Bunk <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Rientjes 2008-02-09 00:10:15 -08:00 • committed by Linus Torvalds
commit 60c12b1202
3 changed files with 7 additions and 9 deletions

View file

@ -399,7 +399,7 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
int ret;
task_lock(task);
ret = task->mm && mm_cgroup(task->mm) == mem;
ret = task->mm && vm_match_cgroup(task->mm, mem);
task_unlock(task);
return ret;
}