diff options
Diffstat (limited to 'mm/memory.c')
-rw-r--r-- | mm/memory.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index 90fb265b32b6..8b6028fc342e 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3244,6 +3244,32 @@ unlock: return 0; } +#ifdef CONFIG_PREEMPT_RT_FULL +void pagefault_disable(void) +{ + migrate_disable(); + current->pagefault_disabled++; + /* + * make sure to have issued the store before a pagefault + * can hit. + */ + barrier(); +} +EXPORT_SYMBOL(pagefault_disable); + +void pagefault_enable(void) +{ + /* + * make sure to issue those last loads/stores before enabling + * the pagefault handler again. + */ + barrier(); + current->pagefault_disabled--; + migrate_enable(); +} +EXPORT_SYMBOL(pagefault_enable); +#endif + /* * By the time we get here, we already hold the mm semaphore * |