linux-kernel - arch/arm64/kernel/proton-pack.c:1117:13: warning: no previous prototype for 'spectre_bhb_patch

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Message-ID: <202207240915.0vl43AvY-lkp@intel.com>
Date:   Sun, 24 Jul 2022 09:24:14 +0800
From:   kernel test robot <lkp@...el.com>
To:     James Morse <james.morse@....com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>
Subject: arch/arm64/kernel/proton-pack.c:1117:13: warning: no previous
 prototype for 'spectre_bhb_patch_clearbhb'

Hi James,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   515f71412bb73ebd7f41f90e1684fc80b8730789
commit: 228a26b912287934789023b4132ba76065d9491c arm64: Use the clearbhb instruction in mitigations
date:   5 months ago
config: arm64-alldefconfig (https://download.01.org/0day-ci/archive/20220724/202207240915.0vl43AvY-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=228a26b912287934789023b4132ba76065d9491c
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 228a26b912287934789023b4132ba76065d9491c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/kernel/

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

All warnings (new ones prefixed by >>):

   arch/arm64/kernel/proton-pack.c:564:13: warning: no previous prototype for 'spectre_v4_patch_fw_mitigation_enable' [-Wmissing-prototypes]
     564 | void __init spectre_v4_patch_fw_mitigation_enable(struct alt_instr *alt,
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/proton-pack.c:584:13: warning: no previous prototype for 'smccc_patch_fw_mitigation_conduit' [-Wmissing-prototypes]
     584 | void __init smccc_patch_fw_mitigation_conduit(struct alt_instr *alt,
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/proton-pack.c:1048:14: warning: no previous prototype for 'spectre_bhb_patch_loop_mitigation_enable' [-Wmissing-prototypes]
    1048 | void noinstr spectre_bhb_patch_loop_mitigation_enable(struct alt_instr *alt,
         |              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/proton-pack.c:1059:14: warning: no previous prototype for 'spectre_bhb_patch_fw_mitigation_enabled' [-Wmissing-prototypes]
    1059 | void noinstr spectre_bhb_patch_fw_mitigation_enabled(struct alt_instr *alt,
         |              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/proton-pack.c:1070:14: warning: no previous prototype for 'spectre_bhb_patch_loop_iter' [-Wmissing-prototypes]
    1070 | void noinstr spectre_bhb_patch_loop_iter(struct alt_instr *alt,
         |              ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/proton-pack.c:1091:14: warning: no previous prototype for 'spectre_bhb_patch_wa3' [-Wmissing-prototypes]
    1091 | void noinstr spectre_bhb_patch_wa3(struct alt_instr *alt,
         |              ^~~~~~~~~~~~~~~~~~~~~
>> arch/arm64/kernel/proton-pack.c:1117:13: warning: no previous prototype for 'spectre_bhb_patch_clearbhb' [-Wmissing-prototypes]
    1117 | void __init spectre_bhb_patch_clearbhb(struct alt_instr *alt,
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/spectre_bhb_patch_clearbhb +1117 arch/arm64/kernel/proton-pack.c

  1115	
  1116	/* Patched to NOP when not supported */
> 1117	void __init spectre_bhb_patch_clearbhb(struct alt_instr *alt,

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