From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xiao Guangrong Subject: [PATCH v7 1/5] export __get_user_pages_fast() function Date: Sat, 21 Aug 2010 11:05:23 +0000 (UTC) Message-ID: <4C710549.9090704@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Marcelo Tosatti , Nick Piggin , KVM , LKML To: Avi Kivity Return-path: Received: from cn.fujitsu.com ([222.73.24.84]:62130 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751342Ab0HULEq (ORCPT ); Sat, 21 Aug 2010 07:04:46 -0400 Date: Sun, 22 Aug 2010 19:08:57 +0800 Sender: kvm-owner@vger.kernel.org List-ID: 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 --- mm/util.c | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-) 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 -- 1.7.0.4