linux-kernel - Re: sched,time: Allow better constprop/DCE for schedule

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Date:   Tue, 27 Aug 2019 08:06:26 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     kbuild-all@...org, Satendra Singh Thakur <sst2005@...il.com>,
        satendrasingh.thakur@....com, Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: sched,time: Allow better constprop/DCE for schedule_timeout()

Hi Peter,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to v5.3-rc6 next-20190826]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Peter-Zijlstra/sched-time-Allow-better-constprop-DCE-for-schedule_timeout/20190827-061612
config: um-x86_64_defconfig (attached as .config)
compiler: gcc-7 (Debian 7.4.0-10) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=um SUBARCH=x86_64

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   In file included from arch/x86/um/shared/sysdep/kernel-offsets.h:3:0,
                    from arch/um/kernel/asm-offsets.c:1:
   include/linux/sched.h: In function 'schedule_timeout':
>> include/linux/sched.h:222:3: error: implicit declaration of function 'schedule'; did you mean 'schedule_work'? [-Werror=implicit-function-declaration]
      schedule();
      ^~~~~~~~
      schedule_work
   include/linux/sched.h: At top level:
   include/linux/sched.h:233:17: warning: conflicting types for 'schedule'
    asmlinkage void schedule(void);
                    ^~~~~~~~
   include/linux/sched.h:222:3: note: previous implicit declaration of 'schedule' was here
      schedule();
      ^~~~~~~~
   cc1: some warnings being treated as errors
   make[2]: *** [arch/um/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [sub-make] Error 2
   8 real  6 user  4 sys  130.06% cpu 	make prepare

vim +222 include/linux/sched.h

   218	
   219	static inline long schedule_timeout(long timeout)
   220	{
   221		if (__builtin_constant_p(timeout) && timeout == MAX_SCHEDULE_TIMEOUT) {
 > 222			schedule();
   223			return timeout;
   224		}
   225	
   226		return __schedule_timeout(timeout);
   227	}
   228	

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0-DAY kernel test infrastructure                Open Source Technology Center
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