linux-kernel - Re: [PATCH 2/2] include: warn for inconsistent endian config definition

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Message-ID: <201706102219.7auwXKYx%fengguang.wu@intel.com>
Date:   Sat, 10 Jun 2017 22:06:20 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Babu Moger <babu.moger@...cle.com>
Cc:     kbuild-all@...org, ysato@...rs.sourceforge.jp,
        geert@...ux-m68k.org, jonas@...thpole.se,
        stefan.kristiansson@...nalahti.fi, shorne@...il.com,
        jejb@...isc-linux.org, deller@....de, davem@...emloft.net,
        viro@...iv.linux.org.uk, mpe@...erman.id.au, peterz@...radead.org,
        mingo@...hat.com, jcmvbkbc@...il.com, linux-kernel@...r.kernel.org,
        uclinux-h8-devel@...ts.sourceforge.jp, linux-m68k@...r.kernel.org,
        openrisc@...ts.librecores.org, linux-parisc@...r.kernel.org,
        sparclinux@...r.kernel.org
Subject: Re: [PATCH 2/2] include: warn for inconsistent endian config
 definition

Hi Babu,

[auto build test WARNING on linus/master]
[also build test WARNING on v4.12-rc4 next-20170609]
[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/Babu-Moger/Define-CPU_BIG_ENDIAN-or-warn-for-inconsistencies/20170610-200424
config: microblaze-mmu_defconfig (attached as .config)
compiler: microblaze-linux-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=microblaze 

All warnings (new ones prefixed by >>):

   In file included from arch/microblaze/include/uapi/asm/byteorder.h:7:0,
                    from include/asm-generic/bitops/le.h:5,
                    from include/asm-generic/bitops.h:34,
                    from arch/microblaze/include/asm/bitops.h:1,
                    from include/linux/bitops.h:36,
                    from include/linux/kernel.h:10,
                    from include/asm-generic/bug.h:15,
                    from arch/microblaze/include/asm/bug.h:1,
                    from include/linux/bug.h:4,
                    from include/linux/page-flags.h:9,
                    from kernel/bounds.c:9:
>> include/linux/byteorder/big_endian.h:7:2: warning: #warning inconsistent configuration, needs CONFIG_CPU_BIG_ENDIAN [-Wcpp]
    #warning inconsistent configuration, needs CONFIG_CPU_BIG_ENDIAN
     ^~~~~~~
--
   In file included from arch/microblaze/include/uapi/asm/byteorder.h:7:0,
                    from include/asm-generic/bitops/le.h:5,
                    from include/asm-generic/bitops.h:34,
                    from arch/microblaze/include/asm/bitops.h:1,
                    from include/linux/bitops.h:36,
                    from include/linux/kernel.h:10,
                    from include/asm-generic/bug.h:15,
                    from arch/microblaze/include/asm/bug.h:1,
                    from include/linux/bug.h:4,
                    from include/linux/page-flags.h:9,
                    from kernel/bounds.c:9:
>> include/linux/byteorder/big_endian.h:7:2: warning: #warning inconsistent configuration, needs CONFIG_CPU_BIG_ENDIAN [-Wcpp]
    #warning inconsistent configuration, needs CONFIG_CPU_BIG_ENDIAN
     ^~~~~~~
   In file included from arch/microblaze/include/uapi/asm/byteorder.h:7:0,
                    from include/asm-generic/bitops/le.h:5,
                    from include/asm-generic/bitops.h:34,
                    from arch/microblaze/include/asm/bitops.h:1,
                    from include/linux/bitops.h:36,
                    from include/linux/kernel.h:10,
                    from include/linux/list.h:8,
                    from include/linux/rculist.h:9,
                    from include/linux/pid.h:4,
                    from include/linux/sched.h:13,
                    from arch/microblaze/kernel/asm-offsets.c:13:
>> include/linux/byteorder/big_endian.h:7:2: warning: #warning inconsistent configuration, needs CONFIG_CPU_BIG_ENDIAN [-Wcpp]
    #warning inconsistent configuration, needs CONFIG_CPU_BIG_ENDIAN
     ^~~~~~~
   <stdin>:1326:2: warning: #warning syscall statx not implemented [-Wcpp]

vim +7 include/linux/byteorder/big_endian.h

     1	#ifndef _LINUX_BYTEORDER_BIG_ENDIAN_H
     2	#define _LINUX_BYTEORDER_BIG_ENDIAN_H
     3	
     4	#include <uapi/linux/byteorder/big_endian.h>
     5	
     6	#ifndef CONFIG_CPU_BIG_ENDIAN
   > 7	#warning inconsistent configuration, needs CONFIG_CPU_BIG_ENDIAN
     8	#endif
     9	
    10	#include <linux/byteorder/generic.h>
    11	#endif /* _LINUX_BYTEORDER_BIG_ENDIAN_H */

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