From 40a10c277f7ec3f14e7de022c1b74545e4c62401 Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Tue, 13 Dec 2011 00:40:34 +0100 Subject: [PATCH] export __get_user_pages_fast() function commit 45888a0c6edc305495b6bd72a30e66bc40b324c6 upstream. Backport for stable kernel v2.6.32.y to v2.6.36.y. Needed for next patch: oprofile, x86: Fix nmi-unsafe callgraph support 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 Signed-off-by: Xiao Guangrong Signed-off-by: Marcelo Tosatti Signed-off-by: Robert Richter Signed-off-by: Greg Kroah-Hartman Signed-off-by: Willy Tarreau --- mm/util.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/mm/util.c b/mm/util.c index cb00b748ce478..434f9257ed69e 100644 --- a/mm/util.c +++ b/mm/util.c @@ -101,6 +101,19 @@ void *__krealloc(const void *p, size_t new_size, gfp_t flags) } EXPORT_SYMBOL(__krealloc); +/* + * 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); + /** * krealloc - reallocate memory. The contents will remain unchanged. * @p: object to reallocate memory for. -- 2.47.2