diff options
| author | Li Zefan <lizf@cn.fujitsu.com> | 2008-10-29 14:00:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-30 11:38:45 -0700 |
| commit | 51308ee59dee1136ed599d875ea8968d7be55c91 (patch) | |
| tree | 8976509c5fbf8171774e7eb7007cf0d4d00f0f83 /kernel | |
| parent | 00c2e63c31d0f431952ff2a671c5c6997dd4f8b2 (diff) | |
| download | lwn-51308ee59dee1136ed599d875ea8968d7be55c91.tar.gz lwn-51308ee59dee1136ed599d875ea8968d7be55c91.zip | |
freezer_cg: simplify freezer_change_state()
Just call unfreeze_cgroup() if goal_state == THAWED, and call
try_to_freeze_cgroup() if goal_state == FROZEN.
No behavior has been changed.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Cedric Le Goater <clg@fr.ibm.com>
Acked-by: Matt Helsley <matthltc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cgroup_freezer.c | 19 |
1 files changed, 7 insertions, 12 deletions
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c index 5e6d26b66e88..7fa476f01d05 100644 --- a/kernel/cgroup_freezer.c +++ b/kernel/cgroup_freezer.c @@ -296,27 +296,22 @@ static int freezer_change_state(struct cgroup *cgroup, int retval = 0; freezer = cgroup_freezer(cgroup); + spin_lock_irq(&freezer->lock); + update_freezer_state(cgroup, freezer); if (goal_state == freezer->state) goto out; - switch (freezer->state) { + + switch (goal_state) { case CGROUP_THAWED: - retval = try_to_freeze_cgroup(cgroup, freezer); + unfreeze_cgroup(cgroup, freezer); break; - case CGROUP_FREEZING: - if (goal_state == CGROUP_FROZEN) { - /* Userspace is retrying after - * "/bin/echo FROZEN > freezer.state" returned -EBUSY */ - retval = try_to_freeze_cgroup(cgroup, freezer); - break; - } - /* state == FREEZING and goal_state == THAWED, so unfreeze */ case CGROUP_FROZEN: - unfreeze_cgroup(cgroup, freezer); + retval = try_to_freeze_cgroup(cgroup, freezer); break; default: - break; + BUG(); } out: spin_unlock_irq(&freezer->lock); |