[V4 PATCH 3/4] kexec: Fix race between panic() and crash_kexec() called directly

[kbuild test robot]

Hi Hidehiro,

[auto build test results on v4.3-rc2 -- if it's inappropriate base, please ignore]

config: x86_64-allnoconfig (attached as .config)
reproduce:
  git checkout 0077681103150af584e5e592c0238fd010654c26
  # save the attached .config to linux build tree
  make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

   kernel/panic.c: In function 'panic':
>> kernel/panic.c:140:3: error: implicit declaration of function '__crash_kexec' [-Werror=implicit-function-declaration]
      __crash_kexec(NULL);
      ^
   cc1: some warnings being treated as errors

vim +/__crash_kexec +140 kernel/panic.c

   134		 * If we have crashed and we have a crash kernel loaded let it handle
   135		 * everything else.
   136		 * If we want to run this after calling panic_notifiers, pass
   137		 * the "crash_kexec_post_notifiers" option to the kernel.
   138		 */
   139		if (!crash_kexec_post_notifiers)
 > 140			__crash_kexec(NULL);
   141	
   142		/*
   143		 * Note smp_send_stop is the usual smp shutdown function, which

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
-------------- next part --------------
A non-text attachment was scrubbed...
Name: .config.gz
Type: application/octet-stream
Size: 6030 bytes
Desc: not available
URL: <http://lists.infradead.org/pipermail/kexec/attachments/20150928/9b92fbda/attachment.obj>