From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f174.google.com (mail-pd0-f174.google.com [209.85.192.174]) by kanga.kvack.org (Postfix) with ESMTP id 52B106B0032 for ; Thu, 22 Jan 2015 15:08:39 -0500 (EST) Received: by mail-pd0-f174.google.com with SMTP id ft15so3628035pdb.5 for ; Thu, 22 Jan 2015 12:08:39 -0800 (PST) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org. [140.211.169.12]) by mx.google.com with ESMTPS id c14si1862660pdl.102.2015.01.22.12.08.37 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 22 Jan 2015 12:08:38 -0800 (PST) Date: Thu, 22 Jan 2015 12:08:20 -0800 From: Andrew Morton Subject: Re: [PATCH] mm: pagewalk: call pte_hole() for VM_PFNMAP during walk_page_range Message-Id: <20150122120820.8c279cf8.akpm@linux-foundation.org> In-Reply-To: <1421820793-28883-1-git-send-email-shashim@codeaurora.org> References: <1421820793-28883-1-git-send-email-shashim@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Shiraz Hashim Cc: linux-mm@kvack.org, oleg@redhat.com, gorcunov@openvz.org, linux-kernel@vger.kernel.org, n-horiguchi@ah.jp.nec.com On Wed, 21 Jan 2015 11:43:13 +0530 Shiraz Hashim wrote: > walk_page_range silently skips vma having VM_PFNMAP set, > which leads to undesirable behaviour at client end (who > called walk_page_range). For example for pagemap_read, > when no callbacks are called against VM_PFNMAP vma, > pagemap_read may prepare pagemap data for next virtual > address range at wrong index. This changelog doesn't have enough information for me to be able to work out whether a -stable backport is needed. Please always describe the user-visible effects of a bug. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org