diff options
Diffstat (limited to 'include/linux/slab.h')
| -rw-r--r-- | include/linux/slab.h | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h index 6b3e155b70bf..360005c6cbfb 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -53,16 +53,18 @@ * stays valid, the trick to using this is relying on an independent * object validation pass. Something like: * - * rcu_read_lock() - * again: + * begin: + * rcu_read_lock(); * obj = lockless_lookup(key); * if (obj) { * if (!try_get_ref(obj)) // might fail for free objects - * goto again; + * rcu_read_unlock(); + * goto begin; * * if (obj->key != key) { // not the object we expected * put_ref(obj); - * goto again; + * rcu_read_unlock(); + * goto begin; * } * } * rcu_read_unlock(); @@ -106,6 +108,18 @@ /* Avoid kmemleak tracing */ #define SLAB_NOLEAKTRACE ((slab_flags_t __force)0x00800000U) +/* + * Prevent merging with compatible kmem caches. This flag should be used + * cautiously. Valid use cases: + * + * - caches created for self-tests (e.g. kunit) + * - general caches created and used by a subsystem, only when a + * (subsystem-specific) debug option is enabled + * - performance critical caches, should be very rare and consulted with slab + * maintainers, and not used together with CONFIG_SLUB_TINY + */ +#define SLAB_NO_MERGE ((slab_flags_t __force)0x01000000U) + /* Fault injection mark */ #ifdef CONFIG_FAILSLAB # define SLAB_FAILSLAB ((slab_flags_t __force)0x02000000U) |