diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2012-07-12 17:55:40 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2012-07-12 17:55:40 +0200 |
| commit | 9c63cd5a955ce8a3de1776a9e4b6b89c69b2a09e (patch) | |
| tree | 2b628ebdaeb63603d90c92e78bc5dd668856b61d /kernel/cgroup.c | |
| parent | 8c203360a751ecbf876a8324e02c1dcbcc5dd548 (diff) | |
| parent | 34ae0dadb4e99e8177f9785e069e9cca636ef8c1 (diff) | |
Merge tag 'imx-defconfig' of git://git.pengutronix.de/git/imx/linux-2.6 into next/defconfig
From Sascha Hauer <s.hauer@pengutronix.de>:
ARM i.MX defconfig updates for v3.6
* tag 'imx-defconfig' of git://git.pengutronix.de/git/imx/linux-2.6:
ARM: imx_v4_v5_defconfig: update features
ARM: imx_v6_v7_defconfig: update features
Includes an update to v3.5-rc5
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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); |