diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/uaccess.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h index 23290cc93a24..90786d2d74e5 100644 --- a/include/linux/uaccess.h +++ b/include/linux/uaccess.h @@ -59,6 +59,18 @@ static inline void pagefault_enable(void) */ #define pagefault_disabled() (current->pagefault_disabled != 0) +/* + * The pagefault handler is in general disabled by pagefault_disable() or + * when in irq context (via in_atomic()). + * + * This function should only be used by the fault handlers. Other users should + * stick to pagefault_disabled(). + * Please NEVER use preempt_disable() to disable the fault handler. With + * !CONFIG_PREEMPT_COUNT, this is like a NOP. So the handler won't be disabled. + * in_atomic() will report different values based on !CONFIG_PREEMPT_COUNT. + */ +#define faulthandler_disabled() (pagefault_disabled() || in_atomic()) + #ifndef ARCH_HAS_NOCACHE_UACCESS static inline unsigned long __copy_from_user_inatomic_nocache(void *to, |