diff options
Diffstat (limited to 'include/linux/hardirq.h')
| -rw-r--r-- | include/linux/hardirq.h | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h index 49829988bfa..181006cc94a 100644 --- a/include/linux/hardirq.h +++ b/include/linux/hardirq.h @@ -72,17 +72,26 @@ #define in_softirq() (softirq_count()) #define in_interrupt() (irq_count()) -#define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0) - -#ifdef CONFIG_PREEMPT +#if defined(CONFIG_PREEMPT) +# define PREEMPT_INATOMIC_BASE kernel_locked() # define PREEMPT_CHECK_OFFSET 1 #else +# define PREEMPT_INATOMIC_BASE 0 # define PREEMPT_CHECK_OFFSET 0 #endif /* + * 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 + * used in the general case to determine whether sleeping is possible. + * Do not use in_atomic() in driver code. + */ +#define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_INATOMIC_BASE) + +/* * Check whether we were atomic before we did preempt_disable(): - * (used by the scheduler) + * (used by the scheduler, *after* releasing the kernel lock) */ #define in_atomic_preempt_off() \ ((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_CHECK_OFFSET) |