diff options
| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-07-05 08:25:34 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-07-05 08:25:34 -0700 |
| commit | 6fbfd0592ef88ba29cdce84ef92757351f1fa9c9 (patch) | |
| tree | 7c0af4bcc08f3ad7befb93d73d9729f82252c950 /kernel/cgroup.c | |
| parent | f2c32a882d2c1cde6fc552a5a3d34b4c1330edb8 (diff) | |
| parent | 6887a4131da3adaab011613776d865f4bcfb5678 (diff) | |
Merge v3.5-rc5 into driver-core-next
This picks up the big printk fixes, and resolves a merge issue with:
drivers/extcon/extcon_gpio.c
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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 72fcd3069a90..2097684cf194 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); |