From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757054Ab3AHXjN (ORCPT ); Tue, 8 Jan 2013 18:39:13 -0500 Received: from mail.windriver.com ([147.11.1.11]:63723 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756935Ab3AHXif (ORCPT ); Tue, 8 Jan 2013 18:38:35 -0500 From: Paul Gortmaker To: , CC: Xiao Guangrong , Marcelo Tosatti , Paul Gortmaker Subject: [v2.6.34-stable 55/77] export __get_user_pages_fast() function Date: Tue, 8 Jan 2013 18:35:34 -0500 Message-ID: <1357688156-25387-56-git-send-email-paul.gortmaker@windriver.com> X-Mailer: git-send-email 1.7.12.1 In-Reply-To: <1357688156-25387-1-git-send-email-paul.gortmaker@windriver.com> References: <1357688156-25387-1-git-send-email-paul.gortmaker@windriver.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Xiao Guangrong ------------------- 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 Signed-off-by: Xiao Guangrong Signed-off-by: Marcelo Tosatti Signed-off-by: Paul Gortmaker --- 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