rt-patches/0030-printk-Add-force_early_printk-boot-param-to-help-wit.patch

   1 From b8ce6b3c2bb4c54a9488eaed224ae4380d142e97 Mon Sep 17 00:00:00 2001
   2 From: Peter Zijlstra <peterz@infradead.org>
   3 Date: Fri, 2 Sep 2011 14:41:29 +0200
   4 Subject: [PATCH 030/366] printk: Add "force_early_printk" boot param to help
   5  with debugging
   6
   7 Gives me an option to screw printk and actually see what the machine
   8 says.
   9
  10 Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
  11 Link: http://lkml.kernel.org/r/1314967289.1301.11.camel@twins
  12 Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
  13 Link: http://lkml.kernel.org/n/tip-ykb97nsfmobq44xketrxs977@git.kernel.org
  14 ---
  15  kernel/printk/printk.c | 7 +++++++
  16  1 file changed, 7 insertions(+)
  17
  18 diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
  19 index d6f2e2a..1bc8365 100644
  20 --- a/kernel/printk/printk.c
  21 +++ b/kernel/printk/printk.c
  22 @@ -1723,6 +1723,13 @@ asmlinkage void early_printk(const char *fmt, ...)
  23   */
  24  static bool __read_mostly printk_killswitch;
  25
  26 +static int __init force_early_printk_setup(char *str)
  27 +{
  28 +       printk_killswitch = true;
  29 +       return 0;
  30 +}
  31 +early_param("force_early_printk", force_early_printk_setup);
  32 +
  33  void printk_kill(void)
  34  {
  35         printk_killswitch = true;
  36 --
  37 1.9.1
  38