From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755061Ab2BEWf3 (ORCPT ); Sun, 5 Feb 2012 17:35:29 -0500 Received: from 1wt.eu ([62.212.114.60]:62106 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754631Ab2BEW07 (ORCPT ); Sun, 5 Feb 2012 17:26:59 -0500 Message-Id: <20120205220952.143885576@pcw.home.local> User-Agent: quilt/0.48-1 Date: Sun, 05 Feb 2012 23:10:52 +0100 From: Willy Tarreau To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Nick Piggin , Xiao Guangrong , Marcelo Tosatti , Robert Richter , Greg KH Subject: [PATCH 63/91] export __get_user_pages_fast() function In-Reply-To: <0635750f5f06ed2ca212b91fcb5c4483@local> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.27-longterm review patch. If anyone has any objections, please let us know. ------------------ 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 --- mm/util.c | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-) Index: longterm-2.6.27/mm/util.c =================================================================== --- longterm-2.6.27.orig/mm/util.c 2012-02-05 22:34:33.070915063 +0100 +++ longterm-2.6.27/mm/util.c 2012-02-05 22:34:43.848914804 +0100 @@ -101,6 +101,19 @@ } 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.