From: Xiao Guangrong <[email protected]> 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 <[email protected]> Signed-off-by: Xiao Guangrong <[email protected]> Signed-off-by: Marcelo Tosatti <[email protected]> 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 -- To unsubscribe from this list: send the line "unsubscribe kvm-commits" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
