[PATCH v2] powerpc: fix build failure by disabling attribute-alias warning

[kbuild test robot]

Hi Christophe,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on powerpc/next]
[also build test ERROR on next-20180530]
[cannot apply to v4.17-rc7]
[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/Christophe-Leroy/powerpc-fix-build-failure-by-disabling-attribute-alias-warning/20180531-030007
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-defconfig (attached as .config)
compiler: powerpc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/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=powerpc 

All errors (new ones prefixed by >>):

>> arch/powerpc/kernel/syscalls.c:66:32: error: unknown option after '#pragma GCC diagnostic' kind [-Werror=pragmas]
    #pragma GCC diagnostic ignored "-Wattribute-alias"
                                   ^~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors
--
>> arch/powerpc/kernel/signal_32.c:1041:32: error: unknown option after '#pragma GCC diagnostic' kind [-Werror=pragmas]
    #pragma GCC diagnostic ignored "-Wattribute-alias"
                                   ^~~~~~~~~~~~~~~~~~~
   arch/powerpc/kernel/signal_32.c:1235:32: error: unknown option after '#pragma GCC diagnostic' kind [-Werror=pragmas]
    #pragma GCC diagnostic ignored "-Wattribute-alias"
                                   ^~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors
--
>> arch/powerpc/kernel/signal_64.c:629:32: error: unknown option after '#pragma GCC diagnostic' kind [-Werror=pragmas]
    #pragma GCC diagnostic ignored "-Wattribute-alias"
                                   ^~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors
--
>> arch/powerpc/kernel/rtas.c:1055:32: error: unknown option after '#pragma GCC diagnostic' kind [-Werror=pragmas]
    #pragma GCC diagnostic ignored "-Wattribute-alias"
                                   ^~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors
--
>> arch/powerpc/kernel/pci_64.c:207:32: error: unknown option after '#pragma GCC diagnostic' kind [-Werror=pragmas]
    #pragma GCC diagnostic ignored "-Wattribute-alias"
                                   ^~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors

vim +66 arch/powerpc/kernel/syscalls.c

    64	
    65	#pragma GCC diagnostic push
  > 66	#pragma GCC diagnostic ignored "-Wattribute-alias"
    67	SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,
    68			unsigned long, prot, unsigned long, flags,
    69			unsigned long, fd, unsigned long, pgoff)
    70	{
    71		return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
    72	}
    73	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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