linux-kernel - [tip:WIP.sched/core 61/63] sound/oss/dmasound/dmasound_core.c:635:4: error: implicit declaration of function 'signal

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Date:   Fri, 3 Feb 2017 06:20:56 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org, tipbuild@...or.com
Subject: [tip:WIP.sched/core 61/63] sound/oss/dmasound/dmasound_core.c:635:4:
 error: implicit declaration of function 'signal_pending'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.sched/core
head:   7f79b5e3727bae36481c9bc5587291d88742291f
commit: 851f7523d850c32dc63b04cacf3a447e1b08e1e9 [61/63] sched/headers: Move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h>
config: m68k-multi_defconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 4.9.0
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 851f7523d850c32dc63b04cacf3a447e1b08e1e9
        # save the attached .config to linux build tree
        make.cross ARCH=m68k 

All errors (new ones prefixed by >>):

   sound/oss/dmasound/dmasound_core.c: In function 'sq_write':
>> sound/oss/dmasound/dmasound_core.c:635:4: error: implicit declaration of function 'signal_pending' [-Werror=implicit-function-declaration]
       if (signal_pending(current)) {
       ^
   cc1: some warnings being treated as errors
--
   /kbuild/src/m68k/sound/oss/dmasound/dmasound_core.c: In function 'sq_write':
>> /kbuild/src/m68k/sound/oss/dmasound/dmasound_core.c:635:4: error: implicit declaration of function 'signal_pending' [-Werror=implicit-function-declaration]
       if (signal_pending(current)) {
       ^
   cc1: some warnings being treated as errors

vim +/signal_pending +635 sound/oss/dmasound/dmasound_core.c

^1da177e Linus Torvalds 2005-04-16  629  				return uWritten > 0 ? uWritten : -EAGAIN;
1a1e0a80 Arnd Bergmann  2014-01-02  630  			}
1a1e0a80 Arnd Bergmann  2014-01-02  631  			if (write_sq.count < write_sq.max_active)
1a1e0a80 Arnd Bergmann  2014-01-02  632  				break;
1a1e0a80 Arnd Bergmann  2014-01-02  633  
1a1e0a80 Arnd Bergmann  2014-01-02  634  			schedule_timeout(HZ);
1a1e0a80 Arnd Bergmann  2014-01-02 @635  			if (signal_pending(current)) {
1a1e0a80 Arnd Bergmann  2014-01-02  636  				finish_wait(&write_sq.action_queue, &wait);
^1da177e Linus Torvalds 2005-04-16  637  				return uWritten > 0 ? uWritten : -EINTR;
^1da177e Linus Torvalds 2005-04-16  638  			}

:::::: The code at line 635 was first introduced by commit
:::::: 1a1e0a80ceb766852e8abd5d4c3d9475611a7d85 sound: oss: dmasound: kill SLEEP() macro to avoid race

:::::: TO: Arnd Bergmann <arnd@...db.de>
:::::: CC: Takashi Iwai <tiwai@...e.de>

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