linux-kernel - Re: [PATCH] um: Avoid longjmp/setjmp symbol clashes with libpthread.a

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Date:   Wed, 24 May 2017 19:22:12 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "open list:USER-MODE LINUX (UML)" 
        <user-mode-linux-devel@...ts.sourceforge.net>,
        "open list:USER-MODE LINUX (UML)" 
        <user-mode-linux-user@...ts.sourceforge.net>
Subject: Re: [PATCH] um: Avoid longjmp/setjmp symbol clashes with libpthread.a

Hi Florian,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.12-rc2 next-20170524]
[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/Florian-Fainelli/um-Avoid-longjmp-setjmp-symbol-clashes-with-libpthread-a/20170524-154948
config: um-x86_64_defconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=um SUBARCH=x86_64

Note: the linux-review/Florian-Fainelli/um-Avoid-longjmp-setjmp-symbol-clashes-with-libpthread-a/20170524-154948 HEAD 09c4f46a9b5f1dacc04d404bc93231fd21c83d78 builds fine.
      It only hurts bisectibility.

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

   arch/um/os-Linux/skas/process.c: In function 'start_idle_thread':
>> arch/um/os-Linux/skas/process.c:579:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^

vim +248 arch/um/kernel/trap.c

^1da177e arch/um/kernel/trap_kern.c Linus Torvalds     2005-04-16  242  
^1da177e arch/um/kernel/trap_kern.c Linus Torvalds     2005-04-16  243  	catcher = current->thread.fault_catcher;
^1da177e arch/um/kernel/trap_kern.c Linus Torvalds     2005-04-16  244  	if (!err)
f72c22e4 arch/um/kernel/trap.c      Richard Weinberger 2013-09-23  245  		goto out;
^1da177e arch/um/kernel/trap_kern.c Linus Torvalds     2005-04-16  246  	else if (catcher != NULL) {
^1da177e arch/um/kernel/trap_kern.c Linus Torvalds     2005-04-16  247  		current->thread.fault_addr = (void *) address;
fab95c55 arch/um/kernel/trap.c      Jeff Dike          2007-10-16 @248  		UML_LONGJMP(catcher, 1);
^1da177e arch/um/kernel/trap_kern.c Linus Torvalds     2005-04-16  249  	}
^1da177e arch/um/kernel/trap_kern.c Linus Torvalds     2005-04-16  250  	else if (current->thread.fault_addr != NULL)
^1da177e arch/um/kernel/trap_kern.c Linus Torvalds     2005-04-16  251  		panic("fault_addr set but no fault catcher");

:::::: The code at line 248 was first introduced by commit
:::::: fab95c55e3b94e219044dc7a558632d08c198771 uml: get rid of do_longjmp

:::::: TO: Jeff Dike <jdike@...toit.com>
:::::: CC: Linus Torvalds <torvalds@...dy.linux-foundation.org>

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0-DAY kernel test infrastructure                Open Source Technology Center
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