diff options
| author | Ingo Molnar <mingo@kernel.org> | 2013-10-03 07:52:21 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-03 07:52:21 +0200 |
| commit | 6c09f6d830d03b78717403e7b42838a2ee2987ae (patch) | |
| tree | 6436ab6a237578406e004c891e134afd266fb95d /lib | |
| parent | Merge branch 'fortglx/3.12/time' into fortglx/3.13/time (diff) | |
| parent | Linux 3.12-rc3 (diff) | |
| download | linux-6c09f6d830d03b78717403e7b42838a2ee2987ae.tar.xz linux-6c09f6d830d03b78717403e7b42838a2ee2987ae.zip | |
Merge tag 'v3.12-rc3' into timers/core
Merge Linux 3.12-rc3 - refresh the tree with the latest fixes before merging new bits.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/kobject.c | 5 | ||||
| -rw-r--r-- | lib/lockref.c | 23 |
2 files changed, 21 insertions, 7 deletions
diff --git a/lib/kobject.c b/lib/kobject.c index 962175134702..669bf190d4fb 100644 --- a/lib/kobject.c +++ b/lib/kobject.c @@ -933,10 +933,7 @@ const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj) bool kobj_ns_current_may_mount(enum kobj_ns_type type) { - bool may_mount = false; - - if (type == KOBJ_NS_TYPE_NONE) - return true; + bool may_mount = true; spin_lock(&kobj_ns_type_lock); if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && diff --git a/lib/lockref.c b/lib/lockref.c index e2cd2c0a8821..6f9d434c1521 100644 --- a/lib/lockref.c +++ b/lib/lockref.c @@ -4,6 +4,22 @@ #ifdef CONFIG_CMPXCHG_LOCKREF /* + * Allow weakly-ordered memory architectures to provide barrier-less + * cmpxchg semantics for lockref updates. + */ +#ifndef cmpxchg64_relaxed +# define cmpxchg64_relaxed cmpxchg64 +#endif + +/* + * Allow architectures to override the default cpu_relax() within CMPXCHG_LOOP. + * This is useful for architectures with an expensive cpu_relax(). + */ +#ifndef arch_mutex_cpu_relax +# define arch_mutex_cpu_relax() cpu_relax() +#endif + +/* * Note that the "cmpxchg()" reloads the "old" value for the * failure case. */ @@ -14,12 +30,13 @@ while (likely(arch_spin_value_unlocked(old.lock.rlock.raw_lock))) { \ struct lockref new = old, prev = old; \ CODE \ - old.lock_count = cmpxchg(&lockref->lock_count, \ - old.lock_count, new.lock_count); \ + old.lock_count = cmpxchg64_relaxed(&lockref->lock_count, \ + old.lock_count, \ + new.lock_count); \ if (likely(old.lock_count == prev.lock_count)) { \ SUCCESS; \ } \ - cpu_relax(); \ + arch_mutex_cpu_relax(); \ } \ } while (0) |