Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758232Ab0HDDc0 (ORCPT ); Tue, 3 Aug 2010 23:32:26 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:56192 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1757520Ab0HDDcZ (ORCPT ); Tue, 3 Aug 2010 23:32:25 -0400 Message-ID: <4C58DE49.1020705@cn.fujitsu.com> Date: Wed, 04 Aug 2010 11:28:09 +0800 From: Xiao Guangrong User-Agent: Thunderbird 2.0.0.24 (Windows/20100228) MIME-Version: 1.0 To: Avi Kivity CC: Marcelo Tosatti , Nick Piggin , LKML , KVM list Subject: [PATCH v6 1/3] export __get_user_pages_fast() function Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1250 Lines: 42 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 -- 1.6.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/