linux-kernel - arch/mips/include/asm/mach-cavium-octeon/mangle-port.h:19:40: error: right shift count >= width of type

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Date:	Sun, 7 Aug 2016 22:01:50 +0800
From:	kbuild test robot <fengguang.wu@...el.com>
To:	"Steven J. Hill" <Steven.Hill@...tec.com>
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: arch/mips/include/asm/mach-cavium-octeon/mangle-port.h:19:40: error:
 right shift count >= width of type

Hi Steven,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0cbbc422d56668528f6efd1234fe908010284082
commit: 1685ddbe35cd4637f7f841d5f9755dd0470bd68d MIPS: Octeon: Changes to support readq()/writeq() usage.
date:   4 weeks ago
config: mips-cavium_octeon_defconfig (attached as .config)
compiler: mips64-linux-gnuabi64-gcc (Debian 5.4.0-6) 5.4.0 20160609
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
        git checkout 1685ddbe35cd4637f7f841d5f9755dd0470bd68d
        # save the attached .config to linux build tree
        make.cross ARCH=mips 

All errors (new ones prefixed by >>):

   In file included from arch/mips/include/asm/io.h:32:0,
                    from arch/mips/include/asm/page.h:176,
                    from arch/mips/vdso/vdso.h:26,
                    from arch/mips/vdso/gettimeofday.c:11:
   arch/mips/include/asm/mach-cavium-octeon/mangle-port.h: In function '__should_swizzle_bits':
>> arch/mips/include/asm/mach-cavium-octeon/mangle-port.h:19:40: error: right shift count >= width of type [-Werror=shift-count-overflow]
     unsigned long did = ((unsigned long)a >> 40) & 0xff;
                                           ^
   cc1: all warnings being treated as errors

vim +19 arch/mips/include/asm/mach-cavium-octeon/mangle-port.h

    13	#ifdef __BIG_ENDIAN
    14	
    15	static inline bool __should_swizzle_bits(volatile void *a)
    16	{
    17		extern const bool octeon_should_swizzle_table[];
    18	
  > 19		unsigned long did = ((unsigned long)a >> 40) & 0xff;
    20		return octeon_should_swizzle_table[did];
    21	}
    22	

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