target/linux/generic/patches-3.10/003-MIPS-Enable-interrupts-in-arch_cpu_idle.patch

   1 From 4fec4a2d70efa390268d1098bd4b008dda0e399e Mon Sep 17 00:00:00 2001
   2 From: Thomas Gleixner <tglx@linutronix.de>
   3 Date: Thu, 2 May 2013 13:33:52 +0000
   4 Subject: [PATCH 3/3] MIPS: Enable interrupts in arch_cpu_idle()
   5
   6 commit cdbedc61c8 (mips: Use generic idle loop) broke MIPS as I did
   7 not realize that MIPS wants to invoke the wait instructions with
   8 interrupts enabled. Don't ask why that works correctly; Ralf suggested
   9 to get thoroughly drunk before even thinking about it. Looking sober
  10 at commit c65a5480 ([MIPS] Fix potential latency problem due to
  11 non-atomic cpu_wait) is not recommended.
  12
  13 Enable interrupts in arch_cpu_idle() on mips to repair the issue.
  14
  15 Reported-and-tested-by: Jonas Gorski <jogo@openwrt.org>
  16 Reported-by: EunBong Song <eunb.song@samsung.com>
  17 Booze-recommended-by: Ralf Baechle <ralf@linux-mips.org>
  18 Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
  19 ---
  20  arch/mips/kernel/process.c |    9 +++++++--
  21  1 file changed, 7 insertions(+), 2 deletions(-)
  22
  23 --- a/arch/mips/kernel/process.c
  24 +++ b/arch/mips/kernel/process.c
  25 @@ -51,13 +51,18 @@ void arch_cpu_idle_dead(void)
  26  }
  27  #endif
  28
  29 -void arch_cpu_idle(void)
  30 +static void smtc_idle_hook(void)
  31  {
  32  #ifdef CONFIG_MIPS_MT_SMTC
  33         extern void smtc_idle_loop_hook(void);
  34 -
  35         smtc_idle_loop_hook();
  36  #endif
  37 +}
  38 +
  39 +void arch_cpu_idle(void)
  40 +{
  41 +       local_irq_enable();
  42 +       smtc_idle_hook();
  43         if (cpu_wait)
  44                 (*cpu_wait)();
  45         else