linux-kernel - Re: [PATCH 3/5] mm: remove MPX hooks from generic code

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Date:   Sat, 5 Jan 2019 06:33:13 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     kbuild-all@...org, dave.hansen@...el.com, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 3/5] mm: remove MPX hooks from generic code

Hi Dave,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.20 next-20190103]
[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/Dave-Hansen/x86-mpx-remove-MPX-APIs/20190105-051028
config: i386-tinyconfig (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 

Note: the linux-review/Dave-Hansen/x86-mpx-remove-MPX-APIs/20190105-051028 HEAD 34ce15ccc190201bc8c062e1559df2c1864902ef builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   arch/x86/kernel/setup.c: In function 'setup_arch':
>> arch/x86/kernel/setup.c:927:2: error: implicit declaration of function 'mpx_mm_init'; did you mean 'mem_init'? [-Werror=implicit-function-declaration]
     mpx_mm_init(&init_mm);
     ^~~~~~~~~~~
     mem_init
   cc1: some warnings being treated as errors

vim +927 arch/x86/kernel/setup.c

7465252ea arch/x86/kernel/setup_32.c Yinghai Lu          2008-06-23  911  
42bbdb43b arch/x86/kernel/setup.c    Thomas Gleixner     2009-08-20  912  	x86_init.oem.arch_setup();
2215e69d2 arch/x86/kernel/setup_32.c Huang, Ying         2008-01-30  913  
419afdf53 arch/x86/kernel/setup.c    Bjorn Helgaas       2010-10-26  914  	iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
103e20630 arch/x86/kernel/setup.c    Ingo Molnar         2017-01-28  915  	e820__memory_setup();
28bb22379 arch/x86/kernel/setup.c    Yinghai Lu          2008-06-30  916  	parse_setup_data();
28bb22379 arch/x86/kernel/setup.c    Yinghai Lu          2008-06-30  917  
^1da177e4 arch/i386/kernel/setup.c   Linus Torvalds      2005-04-16  918  	copy_edd();
^1da177e4 arch/i386/kernel/setup.c   Linus Torvalds      2005-04-16  919  
30c826451 arch/x86/kernel/setup_32.c H. Peter Anvin      2007-10-15  920  	if (!boot_params.hdr.root_flags)
^1da177e4 arch/i386/kernel/setup.c   Linus Torvalds      2005-04-16  921  		root_mountflags &= ~MS_RDONLY;
^1da177e4 arch/i386/kernel/setup.c   Linus Torvalds      2005-04-16  922  	init_mm.start_code = (unsigned long) _text;
^1da177e4 arch/i386/kernel/setup.c   Linus Torvalds      2005-04-16  923  	init_mm.end_code = (unsigned long) _etext;
^1da177e4 arch/i386/kernel/setup.c   Linus Torvalds      2005-04-16  924  	init_mm.end_data = (unsigned long) _edata;
93dbda7cb arch/x86/kernel/setup.c    Jeremy Fitzhardinge 2009-02-26  925  	init_mm.brk = _brk_end;
fe3d197f8 arch/x86/kernel/setup.c    Dave Hansen         2014-11-14  926  
fe3d197f8 arch/x86/kernel/setup.c    Dave Hansen         2014-11-14 @927  	mpx_mm_init(&init_mm);
^1da177e4 arch/i386/kernel/setup.c   Linus Torvalds      2005-04-16  928  
4046d6e81 arch/x86/kernel/setup.c    Linus Torvalds      2016-04-14  929  	code_resource.start = __pa_symbol(_text);
4046d6e81 arch/x86/kernel/setup.c    Linus Torvalds      2016-04-14  930  	code_resource.end = __pa_symbol(_etext)-1;
4046d6e81 arch/x86/kernel/setup.c    Linus Torvalds      2016-04-14  931  	data_resource.start = __pa_symbol(_etext);
4046d6e81 arch/x86/kernel/setup.c    Linus Torvalds      2016-04-14  932  	data_resource.end = __pa_symbol(_edata)-1;
4046d6e81 arch/x86/kernel/setup.c    Linus Torvalds      2016-04-14  933  	bss_resource.start = __pa_symbol(__bss_start);
4046d6e81 arch/x86/kernel/setup.c    Linus Torvalds      2016-04-14  934  	bss_resource.end = __pa_symbol(__bss_stop)-1;
4046d6e81 arch/x86/kernel/setup.c    Linus Torvalds      2016-04-14  935  

:::::: The code at line 927 was first introduced by commit
:::::: fe3d197f84319d3bce379a9c0dc17b1f48ad358c x86, mpx: On-demand kernel allocation of bounds tables

:::::: TO: Dave Hansen <dave.hansen@...ux.intel.com>
:::::: CC: Thomas Gleixner <tglx@...utronix.de>

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