| From | Paul Gortmaker <> | Subject | [v2.6.34-stable 55/77] export __get_user_pages_fast() function | Date | Tue, 8 Jan 2013 18:35:34 -0500 |
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From: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
------------------- This is a commit scheduled for the next v2.6.34 longterm release. http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git If you see a problem with using this for longterm, please comment. -------------------
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> --- mm/util.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/mm/util.c b/mm/util.c index f5712e8..4f0d32b 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 -- 1.7.12.1
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