linux-kernel - [tip:x86/mm 1/23] arch/x86/mm/init.c:75:6: warning: no previous prototype for function 'x86_has_pat

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Date:   Wed, 20 May 2020 01:51:25 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Christoph Hellwig <hch@....de>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Borislav Petkov <bp@...e.de>
Subject: [tip:x86/mm 1/23] arch/x86/mm/init.c:75:6: warning: no previous
 prototype for function 'x86_has_pat_wp'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/mm
head:   bd1de2a7aace4d1d312fb1be264b8fafdb706208
commit: 1f6f655e01adebf5bd5e6c3da2e843c104ded051 [1/23] x86/mm: Add a x86_has_pat_wp() helper
config: x86_64-randconfig-r012-20200519 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 135b877874fae96b4372c8a3fbfaa8ff44ff86e3)
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        git checkout 1f6f655e01adebf5bd5e6c3da2e843c104ded051
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@...el.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> arch/x86/mm/init.c:75:6: warning: no previous prototype for function 'x86_has_pat_wp' [-Wmissing-prototypes]
bool x86_has_pat_wp(void)
^
arch/x86/mm/init.c:75:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
bool x86_has_pat_wp(void)
^
static
arch/x86/mm/init.c:866:13: warning: no previous prototype for function 'mem_encrypt_free_decrypted_mem' [-Wmissing-prototypes]
void __weak mem_encrypt_free_decrypted_mem(void) { }
^
arch/x86/mm/init.c:866:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void __weak mem_encrypt_free_decrypted_mem(void) { }
^
static
2 warnings generated.

vim +/x86_has_pat_wp +75 arch/x86/mm/init.c

    73	
    74	/* Check that the write-protect PAT entry is set for write-protect */
  > 75	bool x86_has_pat_wp(void)
    76	{
    77		return __pte2cachemode_tbl[_PAGE_CACHE_MODE_WP] == _PAGE_CACHE_MODE_WP;
    78	}
    79	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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