linux-kernel - [patch 34/55] lockdep, bug: Exclude TAINT_FIRMWARE

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Date:	Fri, 10 Feb 2012 14:33:38 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Ben Hutchings <ben@...adent.org.uk>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Subject: [patch 34/55] lockdep, bug: Exclude TAINT_FIRMWARE_WORKAROUND from disabling lockdep

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Peter Zijlstra <a.p.zijlstra@...llo.nl>

commit df754e6af2f237a6c020c0daff55a1a609338e31 upstream.

It's unlikely that TAINT_FIRMWARE_WORKAROUND causes false
lockdep messages, so do not disable lockdep in that case.
We still want to keep lockdep disabled in the
TAINT_OOT_MODULE case:

  - bin-only modules can cause various instabilities in
    their and in unrelated kernel code

  - they are impossible to debug for kernel developers

  - they also typically do not have the copyright license
    permission to link to the GPL-ed lockdep code.

Suggested-by: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/n/tip-xopopjjens57r0i13qnyh2yo@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/panic.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -236,8 +236,16 @@ void add_taint(unsigned flag)
 	 * Also we want to keep up lockdep for staging development and
 	 * post-warning case.
 	 */
-	if (flag != TAINT_CRAP && flag != TAINT_WARN && __debug_locks_off())
-		printk(KERN_WARNING "Disabling lock debugging due to kernel taint\n");
+	switch (flag) {
+	case TAINT_CRAP:
+	case TAINT_WARN:
+	case TAINT_FIRMWARE_WORKAROUND:
+		break;
+
+	default:
+		if (__debug_locks_off())
+			printk(KERN_WARNING "Disabling lock debugging due to kernel taint\n");
+	}
 
 	set_bit(flag, &tainted_mask);
 }


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