linux-kernel - [PATCH] lockdep, bug: Exclude TAINT_OOT_MODULE from disabling lock debugging

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Date:	Wed, 07 Dec 2011 14:30:58 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Cc:	Nick Bowler <nbowler@...iptictech.com>, Greg KH <greg@...ah.com>,
	Dave Jones <davej@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Randy Dunlap <rdunlap@...otime.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Debian kernel maintainers <debian-kernel@...ts.debian.org>
Subject: [PATCH] lockdep, bug: Exclude TAINT_OOT_MODULE from disabling lock
 debugging

We do want to allow lock debugging for GPL-compatible modules that are
not (yet) built in-tree.  This was disabled as a side-effect of commit
2449b8ba0745327c5fa49a8d9acffe03b2eded69 ('module,bug: Add
TAINT_OOT_MODULE flag for modules not built in-tree').  Lock debug
warnings now include taint flags, so kernel developers should still
be able to deflect warnings caused by out-of-tree modules.

The TAINT_PROPRIETARY_MODULE flag for non-GPL-compatible modules will
still disable lock debugging.

Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 kernel/panic.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/panic.c b/kernel/panic.c
index 1b83fd8..3458469 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -237,11 +237,12 @@ void add_taint(unsigned flag)
 	 * Can't trust the integrity of the kernel anymore.
 	 * We don't call directly debug_locks_off() because the issue
 	 * is not necessarily serious enough to set oops_in_progress to 1
-	 * Also we want to keep up lockdep for staging development and
-	 * post-warning case.
+	 * Also we want to keep up lockdep for staging/out-of-tree
+	 * development and post-warning case.
 	 */
 	switch (flag) {
 	case TAINT_CRAP:
+	case TAINT_OOT_MODULE:
 	case TAINT_WARN:
 	case TAINT_FIRMWARE_WORKAROUND:
 		break;
-- 
1.7.7.3


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