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| author | Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> | 2010-08-22 19:08:57 +0800 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2010-10-24 10:51:24 +0200 |
| commit | 45888a0c6edc305495b6bd72a30e66bc40b324c6 (patch) | |
| tree | 0f25d2133c8e7d80e7daca039ed383371562ee8e /mm/util.c | |
| parent | f392eb2546170e539668a5ab8df6c1254d15a201 (diff) | |
| download | lwn-45888a0c6edc305495b6bd72a30e66bc40b324c6.tar.gz lwn-45888a0c6edc305495b6bd72a30e66bc40b324c6.zip | |
export __get_user_pages_fast() function
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>
Diffstat (limited to 'mm/util.c')
| -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 4735ea481816..73dac81e9f78 100644 --- a/mm/util.c +++ b/mm/util.c @@ -245,6 +245,19 @@ 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 |