linux-kernel - Re: [PATCH 4/6] x86, memcpy_mcsafe: define copy_to_iter

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Date:   Wed, 2 May 2018 06:17:31 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     kbuild-all@...org, linux-nvdimm@...ts.01.org, x86@...nel.org,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Tony Luck <tony.luck@...el.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...capital.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] x86, memcpy_mcsafe: define copy_to_iter_mcsafe()

Hi Dan,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.17-rc3 next-20180501]
[cannot apply to tip/x86/core]
[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/Dan-Williams/use-memcpy_mcsafe-for-copy_to_iter/20180502-045742
config: i386-randconfig-s1-201817 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   lib/iov_iter.c: In function 'copyout_mcsafe':
>> lib/iov_iter.c:146:7: error: implicit declaration of function 'copy_to_user_mcsafe' [-Werror=implicit-function-declaration]
      n = copy_to_user_mcsafe((__force void *) to, from, n);
          ^~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/copy_to_user_mcsafe +146 lib/iov_iter.c

   141	
   142	static int copyout_mcsafe(void __user *to, const void *from, size_t n)
   143	{
   144		if (access_ok(VERIFY_WRITE, to, n)) {
   145			kasan_check_read(from, n);
 > 146			n = copy_to_user_mcsafe((__force void *) to, from, n);
   147		}
   148		return n;
   149	}
   150	

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