linux-kernel - Re: [PATCHv2 2/5] x86/mm: introduce mmap_{,legacy}

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Date:   Mon, 16 Jan 2017 22:28:10 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Dmitry Safonov <dsafonov@...tuozzo.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        0x7f454c46@...il.com, Dmitry Safonov <dsafonov@...tuozzo.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...e.de>, x86@...nel.org,
        linux-mm@...ck.org
Subject: Re: [PATCHv2 2/5] x86/mm: introduce mmap_{,legacy}_base

Hi Dmitry,

[auto build test ERROR on tip/x86/core]
[also build test ERROR on v4.10-rc4 next-20170116]
[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/Dmitry-Safonov/Fix-compatible-mmap-return-pointer-over-4Gb/20170116-204523
config: i386-randconfig-i1-201703 (attached as .config)
compiler: gcc-4.8 (Debian 4.8.4-1) 4.8.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   mm/mmap.c: In function 'arch_get_unmapped_area_topdown':
>> mm/mmap.c:2039:20: error: 'TASK_UNMAPPED_BASE' undeclared (first use in this function)
      info.low_limit = TASK_UNMAPPED_BASE;
                       ^
   mm/mmap.c:2039:20: note: each undeclared identifier is reported only once for each function it appears in

vim +/TASK_UNMAPPED_BASE +2039 mm/mmap.c

^1da177e Linus Torvalds     2005-04-16  2033  	 * can happen with large stack limits and large mmap()
^1da177e Linus Torvalds     2005-04-16  2034  	 * allocations.
^1da177e Linus Torvalds     2005-04-16  2035  	 */
de1741a1 Alexander Kuleshov 2015-11-05  2036  	if (offset_in_page(addr)) {
db4fbfb9 Michel Lespinasse  2012-12-11  2037  		VM_BUG_ON(addr != -ENOMEM);
db4fbfb9 Michel Lespinasse  2012-12-11  2038  		info.flags = 0;
db4fbfb9 Michel Lespinasse  2012-12-11 @2039  		info.low_limit = TASK_UNMAPPED_BASE;
db4fbfb9 Michel Lespinasse  2012-12-11  2040  		info.high_limit = TASK_SIZE;
db4fbfb9 Michel Lespinasse  2012-12-11  2041  		addr = vm_unmapped_area(&info);
db4fbfb9 Michel Lespinasse  2012-12-11  2042  	}

:::::: The code at line 2039 was first introduced by commit
:::::: db4fbfb9523c93583c339e66023506f651c1d54b mm: vm_unmapped_area() lookup function

:::::: TO: Michel Lespinasse <walken@...gle.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

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