linux-kernel - arch/x86/kernel/cpu/feat_ctl.c:8:6: warning: no previous prototype for 'init_ia32_feat

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Date:   Tue, 28 Sep 2021 14:57:13 +0800
From:   kernel test robot <lkp@...el.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Borislav Petkov <bp@...e.de>
Subject: arch/x86/kernel/cpu/feat_ctl.c:8:6: warning: no previous prototype
 for 'init_ia32_feat_ctl'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   92477dd1faa650e50bd3bb35a6c0b8d09198cc35
commit: 501444905fcb4166589fda99497c273ac5efc65e x86/centaur: Use common IA32_FEAT_CTL MSR initialization
date:   1 year, 9 months ago
config: i386-randconfig-r036-20210927 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=501444905fcb4166589fda99497c273ac5efc65e
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 501444905fcb4166589fda99497c273ac5efc65e
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

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

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/cpu/feat_ctl.c:8:6: warning: no previous prototype for 'init_ia32_feat_ctl' [-Wmissing-prototypes]
       8 | void init_ia32_feat_ctl(struct cpuinfo_x86 *c)
         |      ^~~~~~~~~~~~~~~~~~


vim +/init_ia32_feat_ctl +8 arch/x86/kernel/cpu/feat_ctl.c

1db2a6e1e29ff994 Sean Christopherson 2019-12-20  7  
1db2a6e1e29ff994 Sean Christopherson 2019-12-20 @8  void init_ia32_feat_ctl(struct cpuinfo_x86 *c)

:::::: The code at line 8 was first introduced by commit
:::::: 1db2a6e1e29ff994443a9eef7cf3d26104c777a7 x86/intel: Initialize IA32_FEAT_CTL MSR at boot

:::::: TO: Sean Christopherson <sean.j.christopherson@...el.com>
:::::: CC: Borislav Petkov <bp@...e.de>

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

Download attachment ".config.gz" of type "application/gzip" (32067 bytes)