target/linux/generic/patches-3.2/030-lockdep-bug-Exclude-TAINT_FIRMWARE_WORKAROUND-from-d.patch

   1 From df754e6af2f237a6c020c0daff55a1a609338e31 Mon Sep 17 00:00:00 2001
   2 From: Peter Zijlstra <a.p.zijlstra@chello.nl>
   3 Date: Mon, 14 Nov 2011 13:13:49 +0100
   4 Subject: [PATCH 1/2] lockdep, bug: Exclude TAINT_FIRMWARE_WORKAROUND from disabling lockdep
   5
   6 It's unlikely that TAINT_FIRMWARE_WORKAROUND causes false
   7 lockdep messages, so do not disable lockdep in that case.
   8 We still want to keep lockdep disabled in the
   9 TAINT_OOT_MODULE case:
  10
  11   - bin-only modules can cause various instabilities in
  12     their and in unrelated kernel code
  13
  14   - they are impossible to debug for kernel developers
  15
  16   - they also typically do not have the copyright license
  17     permission to link to the GPL-ed lockdep code.
  18
  19 Suggested-by: Ben Hutchings <ben@decadent.org.uk>
  20 Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
  21 Link: http://lkml.kernel.org/n/tip-xopopjjens57r0i13qnyh2yo@git.kernel.org
  22 Signed-off-by: Ingo Molnar <mingo@elte.hu>
  23 ---
  24  kernel/panic.c |   12 ++++++++++--
  25  1 files changed, 10 insertions(+), 2 deletions(-)
  26
  27 --- a/kernel/panic.c
  28 +++ b/kernel/panic.c
  29 @@ -240,8 +240,16 @@ void add_taint(unsigned flag)
  30          * Also we want to keep up lockdep for staging development and
  31          * post-warning case.
  32          */
  33 -       if (flag != TAINT_CRAP && flag != TAINT_WARN && __debug_locks_off())
  34 -               printk(KERN_WARNING "Disabling lock debugging due to kernel taint\n");
  35 +       switch (flag) {
  36 +       case TAINT_CRAP:
  37 +       case TAINT_WARN:
  38 +       case TAINT_FIRMWARE_WORKAROUND:
  39 +               break;
  40 +
  41 +       default:
  42 +               if (__debug_locks_off())
  43 +                       printk(KERN_WARNING "Disabling lock debugging due to kernel taint\n");
  44 +       }
  45
  46         set_bit(flag, &tainted_mask);
  47  }