diff options
| -rw-r--r-- | include/linux/uaccess.h | 30 | ||||
| -rw-r--r-- | mm/memory.c | 2 |
2 files changed, 30 insertions, 2 deletions
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h index 9414a1b..44b3751 100644 --- a/include/linux/uaccess.h +++ b/include/linux/uaccess.h @@ -8,8 +8,34 @@ * These routines enable/disable the pagefault handler in that * it will not take any MM locks and go straight to the fixup table. */ +static inline void raw_pagefault_disable(void) +{ + inc_preempt_count(); + barrier(); +} + +static inline void raw_pagefault_enable(void) +{ + barrier(); + dec_preempt_count(); + barrier(); + preempt_check_resched(); +} + +#ifndef CONFIG_PREEMPT_RT_FULL +static inline void pagefault_disable(void) +{ + raw_pagefault_disable(); +} + +static inline void pagefault_enable(void) +{ + raw_pagefault_enable(); +} +#else extern void pagefault_disable(void); extern void pagefault_enable(void); +#endif #ifndef ARCH_HAS_NOCACHE_UACCESS @@ -50,9 +76,9 @@ static inline unsigned long __copy_from_user_nocache(void *to, mm_segment_t old_fs = get_fs(); \ \ set_fs(KERNEL_DS); \ - pagefault_disable(); \ + raw_pagefault_disable(); \ ret = __copy_from_user_inatomic(&(retval), (__force typeof(retval) __user *)(addr), sizeof(retval)); \ - pagefault_enable(); \ + raw_pagefault_enable(); \ set_fs(old_fs); \ ret; \ }) diff --git a/mm/memory.c b/mm/memory.c index 7ad7e6d..efe0d86 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3742,6 +3742,7 @@ unlock: return 0; } +#ifdef CONFIG_PREEMPT_RT_FULL void pagefault_disable(void) { inc_preempt_count(); @@ -3770,6 +3771,7 @@ void pagefault_enable(void) preempt_check_resched(); } EXPORT_SYMBOL(pagefault_enable); +#endif /* * By the time we get here, we already hold the mm semaphore |