This is a note to let you know that I've just added the patch titled
lockdep, bug: Exclude TAINT_FIRMWARE_WORKAROUND from disabling lockdep
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
lockdep-bug-exclude-taint_firmware_workaround-from-disabling-lockdep.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From df754e6af2f237a6c020c0daff55a1a609338e31 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <[email protected]>
Date: Mon, 14 Nov 2011 13:13:49 +0100
Subject: lockdep, bug: Exclude TAINT_FIRMWARE_WORKAROUND from disabling lockdep
From: Peter Zijlstra <[email protected]>
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 <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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);
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/sched-rt-fix-task-stack-corruption-under-__arch_want_interrupts_on_ctxsw.patch
queue-3.0/lockdep-bug-exclude-taint_firmware_workaround-from-disabling-lockdep.patch
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