linux-kernel - Re: [PATCH 05/10] binfmt_flat: use proper user space accessors with relocs processing code

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Message-ID: <201607130653.VJzrObS7%fengguang.wu@intel.com>
Date:	Wed, 13 Jul 2016 06:21:33 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:	kbuild-all@...org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	David Howells <dhowells@...hat.com>,
	Greg Ungerer <gerg@...ux-m68k.org>
Subject: Re: [PATCH 05/10] binfmt_flat: use proper user space accessors with
 relocs processing code

Hi,

[auto build test ERROR on arm/for-next]
[also build test ERROR on v4.7-rc7 next-20160712]
[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/Nicolas-Pitre/binfmt_flat-assorted-cleanups/20160713-055609
base:   http://repo.or.cz/linux-2.6/linux-2.6-arm.git for-next
config: sh-allyesconfig (attached as .config)
compiler: sh4-linux-gnu-gcc (Debian 5.3.1-8) 5.3.1 20160205
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=sh 

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

   In file included from include/linux/flat.h:12:0,
                    from fs/binfmt_flat.c:36:
   fs/binfmt_flat.c: In function 'load_flat_file':
>> arch/sh/include/asm/flat.h:19:26: error: implicit declaration of function '__get_user_unaligned' [-Werror=implicit-function-declaration]
     ({ unsigned long __val; __get_user_unaligned(__val, rp); __val; })
                             ^
>> fs/binfmt_flat.c:771:11: note: in expansion of macro 'flat_get_addr_from_rp'
       addr = flat_get_addr_from_rp(rp, relval, flags,
              ^
>> arch/sh/include/asm/flat.h:20:46: error: implicit declaration of function '__put_user_unaligned' [-Werror=implicit-function-declaration]
    #define flat_put_addr_at_rp(rp, val, relval) __put_user_unaligned(val, rp)
                                                 ^
>> fs/binfmt_flat.c:787:5: note: in expansion of macro 'flat_put_addr_at_rp'
        flat_put_addr_at_rp(rp, addr, relval);
        ^
>> arch/sh/include/asm/flat.h:19:26: warning: '__val' may be used uninitialized in this function [-Wmaybe-uninitialized]
     ({ unsigned long __val; __get_user_unaligned(__val, rp); __val; })
                             ^
   arch/sh/include/asm/flat.h:19:19: note: '__val' was declared here
     ({ unsigned long __val; __get_user_unaligned(__val, rp); __val; })
                      ^
>> fs/binfmt_flat.c:771:11: note: in expansion of macro 'flat_get_addr_from_rp'
       addr = flat_get_addr_from_rp(rp, relval, flags,
              ^
   cc1: some warnings being treated as errors

vim +/__get_user_unaligned +19 arch/sh/include/asm/flat.h

    13	#define __ASM_SH_FLAT_H
    14	
    15	#define	flat_argvp_envp_on_stack()		0
    16	#define	flat_old_ram_flag(flags)		(flags)
    17	#define	flat_reloc_valid(reloc, size)		((reloc) <= (size))
    18	#define	flat_get_addr_from_rp(rp, relval, flags, p) \
  > 19		({ unsigned long __val; __get_user_unaligned(__val, rp); __val; })
  > 20	#define	flat_put_addr_at_rp(rp, val, relval)	__put_user_unaligned(val, rp)
    21	#define	flat_get_relocate_addr(rel)		(rel)
    22	#define	flat_set_persistent(relval, p)		({ (void)p; 0; })
    23	

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