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| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-06-25 09:52:59 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-06-25 09:52:59 +0100 |
| commit | d1e16c1a61d68692dba346f4a841315343b085f4 (patch) | |
| tree | 249ec07d1489769fe83b4ec507708455cc0c5138 /kernel/cgroup.c | |
| parent | 1573ee81cb9ef24fa5acee6b7442e215e63ede2f (diff) | |
| parent | 6b16351acbd415e66ba16bf7d473ece1574cf0bc (diff) | |
| download | olio-linux-3.10-d1e16c1a61d68692dba346f4a841315343b085f4.tar.xz olio-linux-3.10-d1e16c1a61d68692dba346f4a841315343b085f4.zip | |
Merge tag 'v3.5-rc4' into for-3.6
Linux 3.5-rc4 contains some bug fixes which overlap with new features.
Diffstat (limited to 'kernel/cgroup.c')
| -rw-r--r-- | kernel/cgroup.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 72fcd3069a9..2097684cf19 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -255,12 +255,17 @@ int cgroup_lock_is_held(void) EXPORT_SYMBOL_GPL(cgroup_lock_is_held); +static int css_unbias_refcnt(int refcnt) +{ + return refcnt >= 0 ? refcnt : refcnt - CSS_DEACT_BIAS; +} + /* the current nr of refs, always >= 0 whether @css is deactivated or not */ static int css_refcnt(struct cgroup_subsys_state *css) { int v = atomic_read(&css->refcnt); - return v >= 0 ? v : v - CSS_DEACT_BIAS; + return css_unbias_refcnt(v); } /* convenient tests for these bits */ @@ -4982,10 +4987,12 @@ EXPORT_SYMBOL_GPL(__css_tryget); void __css_put(struct cgroup_subsys_state *css) { struct cgroup *cgrp = css->cgroup; + int v; rcu_read_lock(); - atomic_dec(&css->refcnt); - switch (css_refcnt(css)) { + v = css_unbias_refcnt(atomic_dec_return(&css->refcnt)); + + switch (v) { case 1: if (notify_on_release(cgrp)) { set_bit(CGRP_RELEASABLE, &cgrp->flags); |