diff options
author | Ingo Molnar <mingo@elte.hu> | 2009-07-03 13:30:37 (GMT) |
---|---|---|
committer | Scott Wood <scottwood@freescale.com> | 2013-04-04 22:09:09 (GMT) |
commit | 86e57c2dc838d57324ccc333a36c32e12df4f11f (patch) | |
tree | 61415aa15cb37d84a68b575bc199a99ec236e8a3 /mm | |
parent | 959661cdb998fe5c3d9109340f1596e3b61907ec (diff) | |
download | linux-fsl-qoriq-86e57c2dc838d57324ccc333a36c32e12df4f11f.tar.xz |
mm: Prepare decoupling the page fault disabling logic
Add a pagefault_disabled variable to task_struct to allow decoupling
the pagefault-disabled logic from the preempt count.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/memory.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index bb1369f..2f059a9 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3669,6 +3669,35 @@ unlock: return 0; } +void pagefault_disable(void) +{ + inc_preempt_count(); + 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--; + dec_preempt_count(); + /* + * make sure we do.. + */ + barrier(); + preempt_check_resched(); +} +EXPORT_SYMBOL(pagefault_enable); + /* * By the time we get here, we already hold the mm semaphore */ |