target/linux/goldfish/patches-2.6.30/0058-sched-Enable-might_sleep-before-initializing-driver.patch

   1 From 10276fd993c6e4c92d8086a6ccd0c9e0ff53b053 Mon Sep 17 00:00:00 2001
   2 From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
   3 Date: Wed, 10 Dec 2008 20:06:28 -0800
   4 Subject: [PATCH 058/134] sched: Enable might_sleep before initializing drivers.
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=utf-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 This allows detection of init bugs in built-in drivers.
  10
  11 Signed-off-by: Arve Hjønnevåg <arve@android.com>
  12 ---
  13  kernel/sched.c |   14 ++++++++++++--
  14  1 files changed, 12 insertions(+), 2 deletions(-)
  15
  16 --- a/kernel/sched.c
  17 +++ b/kernel/sched.c
  18 @@ -9064,13 +9064,23 @@ void __init sched_init(void)
  19  }
  20
  21  #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
  22 +static int __might_sleep_init_called;
  23 +int __init __might_sleep_init(void)
  24 +{
  25 +       __might_sleep_init_called = 1;
  26 +       return 0;
  27 +}
  28 +early_initcall(__might_sleep_init);
  29 +
  30  void __might_sleep(char *file, int line)
  31  {
  32  #ifdef in_atomic
  33         static unsigned long prev_jiffy;        /* ratelimiting */
  34
  35 -       if ((!in_atomic() && !irqs_disabled()) ||
  36 -                   system_state != SYSTEM_RUNNING || oops_in_progress)
  37 +       if ((!in_atomic() && !irqs_disabled()) || oops_in_progress)
  38 +               return;
  39 +       if (system_state != SYSTEM_RUNNING &&
  40 +           (!__might_sleep_init_called || system_state != SYSTEM_BOOTING))
  41                 return;
  42         if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy)
  43                 return;