linux-kernel - Re: [PATCH] freezer: fix freeze timeout on exec

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Date:   Sun, 11 Nov 2018 17:50:18 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Chanho Min <chanho.min@....com>
Cc:     kbuild-all@...org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Christian Brauner <christian@...uner.io>,
        Oleg Nesterov <oleg@...hat.com>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Seungho Park <seungho1.park@....com>,
        Chanho Min <chanho.min@....com>
Subject: Re: [PATCH] freezer: fix freeze timeout on exec

Hi Chanho,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v4.20-rc1 next-20181109]
[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/Chanho-Min/freezer-fix-freeze-timeout-on-exec/20181111-171200
config: i386-randconfig-x070-201845 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   In file included from arch/x86/include/asm/atomic.h:5:0,
                    from include/linux/atomic.h:7,
                    from include/linux/crypto.h:20,
                    from arch/x86/kernel/asm-offsets.c:9:
   include/linux/freezer.h: In function 'try_to_freeze_unsafe':
   include/linux/freezer.h:64:30: error: dereferencing pointer to incomplete type 'struct signal_struct'
     if (unlikely(current->signal->flags & SIGNAL_GROUP_EXIT))
                                 ^
   include/linux/compiler.h:58:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^~~~
>> include/linux/freezer.h:64:2: note: in expansion of macro 'if'
     if (unlikely(current->signal->flags & SIGNAL_GROUP_EXIT))
     ^~
   include/linux/compiler.h:48:24: note: in expansion of macro '__branch_check__'
    #  define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x)))
                           ^~~~~~~~~~~~~~~~
   include/linux/freezer.h:64:6: note: in expansion of macro 'unlikely'
     if (unlikely(current->signal->flags & SIGNAL_GROUP_EXIT))
         ^~~~~~~~
   include/linux/freezer.h:64:40: error: 'SIGNAL_GROUP_EXIT' undeclared (first use in this function)
     if (unlikely(current->signal->flags & SIGNAL_GROUP_EXIT))
                                           ^
   include/linux/compiler.h:58:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^~~~
>> include/linux/freezer.h:64:2: note: in expansion of macro 'if'
     if (unlikely(current->signal->flags & SIGNAL_GROUP_EXIT))
     ^~
   include/linux/compiler.h:48:24: note: in expansion of macro '__branch_check__'
    #  define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x)))
                           ^~~~~~~~~~~~~~~~
   include/linux/freezer.h:64:6: note: in expansion of macro 'unlikely'
     if (unlikely(current->signal->flags & SIGNAL_GROUP_EXIT))
         ^~~~~~~~
   include/linux/freezer.h:64:40: note: each undeclared identifier is reported only once for each function it appears in
     if (unlikely(current->signal->flags & SIGNAL_GROUP_EXIT))
                                           ^
   include/linux/compiler.h:58:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^~~~
>> include/linux/freezer.h:64:2: note: in expansion of macro 'if'
     if (unlikely(current->signal->flags & SIGNAL_GROUP_EXIT))
     ^~
   include/linux/compiler.h:48:24: note: in expansion of macro '__branch_check__'
    #  define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x)))
                           ^~~~~~~~~~~~~~~~
   include/linux/freezer.h:64:6: note: in expansion of macro 'unlikely'
     if (unlikely(current->signal->flags & SIGNAL_GROUP_EXIT))
         ^~~~~~~~
   make[2]: *** [arch/x86/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

vim +/if +64 include/linux/freezer.h

    50	
    51	/*
    52	 * DO NOT ADD ANY NEW CALLERS OF THIS FUNCTION
    53	 * If try_to_freeze causes a lockdep warning it means the caller may deadlock
    54	 */
    55	static inline bool try_to_freeze_unsafe(void)
    56	{
    57		might_sleep();
    58		if (likely(!freezing(current)))
    59			return false;
    60		/*
    61		 * we are going to call do_exit() really soon,
    62		 * we have a pending SIGKILL
    63		 */
  > 64		if (unlikely(current->signal->flags & SIGNAL_GROUP_EXIT))
    65			return false;
    66		return __refrigerator(false);
    67	}
    68	

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