The patch titled
From: Nick Piggin <npiggin@xxxxxxx>
has been removed from the -mm tree. Its filename was
mm-debug-write-deadlocks.patch
This patch was dropped because it is obsolete
------------------------------------------------------
Subject: From: Nick Piggin <npiggin@xxxxxxx>
From: Nick Piggin <npiggin@xxxxxxx>
Return-Path: <npiggin@xxxxxxx>
Received: from localhost (bix [127.0.0.1])
by localhost.localdomain (8.12.10/8.12.10) with ESMTP id l148oufM016774
for <akpm@localhost>; Sun, 4 Feb 2007 00:50:57 -0800
Received: from bix [127.0.0.1]
by localhost with POP3 (fetchmail-6.2.0)
for akpm@localhost (single-drop); Sun, 04 Feb 2007 00:50:57 -0800 (PST)
Received: from smtp1.osdl.org (smtp1.osdl.org [65.172.181.25])
by shell0.pdx.osdl.net (8.13.1/8.11.6) with ESMTP id l148odLe025844
for <akpm@xxxxxxxxxxxxxxxxxxxxx>; Sun, 4 Feb 2007 00:50:39 -0800
Received: from mx2.suse.de (ns2.suse.de [195.135.220.15])
by smtp1.osdl.org (8.13.5.20060308/8.13.5/Debian-3ubuntu1.1) with ESMTP id l148oW4Y002450
(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL)
for <akpm@xxxxxxxx>; Sun, 4 Feb 2007 00:50:34 -0800
Received: from Relay1.suse.de (mail2.suse.de [195.135.221.8])
(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
(No client certificate requested)
by mx2.suse.de (Postfix) with ESMTP id A4ADB217E4;
Sun, 4 Feb 2007 09:50:31 +0100 (CET)
To: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Linux Kernel <linux-kernel@xxxxxxxxxxxxxxx>,
Linux Filesystems <linux-fsdevel@xxxxxxxxxxxxxxx>,
Nick Piggin <npiggin@xxxxxxx>,
Linux Memory Management <linux-mm@xxxxxxxxx>
Message-Id: <20070204063754.23659.28403.sendpatchset@xxxxxxxxxx>
In-Reply-To: <20070204063707.23659.20741.sendpatchset@xxxxxxxxxx>
References: <20070204063707.23659.20741.sendpatchset@xxxxxxxxxx>
Subject: [patch 5/9] mm: debug write deadlocks
Date: Sun, 4 Feb 2007 09:50:28 +0100 (CET)
Received-SPF: none (domain of npiggin@xxxxxxx does not designate permitted sender hosts)
X-MIMEDefang-Filter: osdl$Revision: 1.173 $
X-Scanned-By: MIMEDefang 2.53 on 65.172.181.25
X-Spam-Checker-Version: SpamAssassin 3.0.2 (2004-11-16) on bix
X-Spam-Level:
X-Spam-Status: No, score=-1.7 required=2.0 tests=AWL,BAYES_00 autolearn=ham
version=3.0.2
Allow CONFIG_DEBUG_VM to switch off the prefaulting logic, to simulate the
difficult race where the page may be unmapped before calling copy_from_user.
Makes the race much easier to hit.
This is useful for demonstration and testing purposes, but is removed in a
subsequent patch.
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
Index: linux-2.6/mm/filemap.c
===================================================================
--- linux-2.6.orig/mm/filemap.c
+++ linux-2.6/mm/filemap.c
@@ -2103,6 +2103,7 @@ generic_file_buffered_write(struct kiocb
if (maxlen > bytes)
maxlen = bytes;
+#ifndef CONFIG_DEBUG_VM
/*
* Bring in the user page that we will copy from _first_.
* Otherwise there's a nasty deadlock on copying from the
@@ -2110,6 +2111,7 @@ generic_file_buffered_write(struct kiocb
* up-to-date.
*/
fault_in_pages_readable(buf, maxlen);
+#endif
page = __grab_cache_page(mapping,index,&cached_page,&lru_pvec);
if (!page) {
Patches currently in -mm which might be from npiggin@xxxxxxx are
mm-only-mm-debug-write-deadlocks.patch
mm-fix-pagecache-write-deadlocks.patch
mm-fix-pagecache-write-deadlocks-comment.patch
mm-fix-pagecache-write-deadlocks-mm-pagecache-write-deadlocks-efault-fix.patch
mm-fix-pagecache-write-deadlocks-zerolength-fix.patch
mm-fix-pagecache-write-deadlocks-stale-holes-fix.patch
fs-prepare_write-fixes.patch
fs-prepare_write-fixes-fuse-fix.patch
fs-prepare_write-fixes-jffs-fix.patch
fs-prepare_write-fixes-fat-fix.patch
fs-fix-cont-vs-deadlock-patches.patch
git-block.patch
buffer-memorder-fix.patch
sched-avoid-div-in-rebalance_tick.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
