diff options
Diffstat (limited to 'include/linux/uaccess.h')
| -rw-r--r-- | include/linux/uaccess.h | 41 |
1 files changed, 20 insertions, 21 deletions
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h index 5ca0951e1855..44b37510c14f 100644 --- a/include/linux/uaccess.h +++ b/include/linux/uaccess.h @@ -6,38 +6,37 @@ /* * These routines enable/disable the pagefault handler in that - * it will not take any locks and go straight to the fixup table. - * - * They have great resemblance to the preempt_disable/enable calls - * and in fact they are identical; this is because currently there is - * no other way to make the pagefault handlers do this. So we do - * disable preemption but we don't necessarily care about that. + * it will not take any MM locks and go straight to the fixup table. */ -static inline void pagefault_disable(void) +static inline void raw_pagefault_disable(void) { inc_preempt_count(); - /* - * make sure to have issued the store before a pagefault - * can hit. - */ barrier(); } -static inline void pagefault_enable(void) +static inline void raw_pagefault_enable(void) { - /* - * make sure to issue those last loads/stores before enabling - * the pagefault handler again. - */ barrier(); dec_preempt_count(); - /* - * make sure we do.. - */ 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 static inline unsigned long __copy_from_user_inatomic_nocache(void *to, @@ -77,9 +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; \ }) |