diff options
Diffstat (limited to 'include/linux/preempt_mask.h')
| -rw-r--r-- | include/linux/preempt_mask.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/preempt_mask.h b/include/linux/preempt_mask.h index d169820203dd..b8d96bca4357 100644 --- a/include/linux/preempt_mask.h +++ b/include/linux/preempt_mask.h @@ -79,6 +79,21 @@ #endif /* + * The preempt_count offset needed for things like: + * + * spin_lock_bh() + * + * Which need to disable both preemption (CONFIG_PREEMPT_COUNT) and + * softirqs, such that unlock sequences of: + * + * spin_unlock(); + * local_bh_enable(); + * + * Work as expected. + */ +#define SOFTIRQ_LOCK_OFFSET (SOFTIRQ_DISABLE_OFFSET + PREEMPT_CHECK_OFFSET) + +/* * Are we running in atomic context? WARNING: this macro cannot * always detect atomic context; in particular, it cannot know about * held spinlocks in non-preemptible kernels. Thus it should not be |