diff options
| author | Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> | 2010-08-22 19:08:57 +0800 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2013-01-16 16:45:04 -0500 |
| commit | b17a40e94bab5b7bdc17231756ef8fab4b9318f0 (patch) | |
| tree | c67792b205845bd16dc5e6218e27999b1f9a853d | |
| parent | 9d6b8fa025237243e1782c358c83f20062d39fbe (diff) | |
export __get_user_pages_fast() function
commit 45888a0c6edc305495b6bd72a30e66bc40b324c6 upstream.
This function is used by KVM to pin process's page in the atomic context.
Define the 'weak' function to avoid other architecture not support it
Acked-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
| -rw-r--r-- | mm/util.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c index f5712e8964be..4f0d32b589f6 100644 --- a/mm/util.c +++ b/mm/util.c @@ -250,6 +250,19 @@ void arch_pick_mmap_layout(struct mm_struct *mm) } #endif +/* + * Like get_user_pages_fast() except its IRQ-safe in that it won't fall + * back to the regular GUP. + * If the architecture not support this fucntion, simply return with no + * page pinned + */ +int __attribute__((weak)) __get_user_pages_fast(unsigned long start, + int nr_pages, int write, struct page **pages) +{ + return 0; +} +EXPORT_SYMBOL_GPL(__get_user_pages_fast); + /** * get_user_pages_fast() - pin user pages in memory * @start: starting user address |