linux-kernel - arch/arm64/kernel/proton-pack.c:775:14: warning: no previous prototype for 'spectre_bhb_patch_loop_mitigation

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Message-ID: <202207240659.cxSiTCFF-lkp@intel.com>
Date:   Sun, 24 Jul 2022 07:01:21 +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,
        Catalin Marinas <catalin.marinas@....com>
Subject: arch/arm64/kernel/proton-pack.c:775:14: warning: no previous
 prototype for 'spectre_bhb_patch_loop_mitigation_enable'

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: ba2689234be92024e5635d30fe744f4853ad97db arm64: entry: Add vectors that have the bhb mitigation sequences
date:   5 months ago
config: arm64-alldefconfig (https://download.01.org/0day-ci/archive/20220724/202207240659.cxSiTCFF-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=ba2689234be92024e5635d30fe744f4853ad97db
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout ba2689234be92024e5635d30fe744f4853ad97db
        # 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:537:13: warning: no previous prototype for 'spectre_v4_patch_fw_mitigation_enable' [-Wmissing-prototypes]
     537 | void __init spectre_v4_patch_fw_mitigation_enable(struct alt_instr *alt,
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/proton-pack.c:557:13: warning: no previous prototype for 'smccc_patch_fw_mitigation_conduit' [-Wmissing-prototypes]
     557 | void __init smccc_patch_fw_mitigation_conduit(struct alt_instr *alt,
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/arm64/kernel/proton-pack.c:775:14: warning: no previous prototype for 'spectre_bhb_patch_loop_mitigation_enable' [-Wmissing-prototypes]
     775 | void noinstr spectre_bhb_patch_loop_mitigation_enable(struct alt_instr *alt,
         |              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/arm64/kernel/proton-pack.c:783:14: warning: no previous prototype for 'spectre_bhb_patch_fw_mitigation_enabled' [-Wmissing-prototypes]
     783 | void noinstr spectre_bhb_patch_fw_mitigation_enabled(struct alt_instr *alt,
         |              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/spectre_bhb_patch_loop_mitigation_enable +775 arch/arm64/kernel/proton-pack.c

   773	
   774	/* Patched to NOP when enabled */
 > 775	void noinstr spectre_bhb_patch_loop_mitigation_enable(struct alt_instr *alt,
   776							     __le32 *origptr,
   777							      __le32 *updptr, int nr_inst)
   778	{
   779		BUG_ON(nr_inst != 1);
   780	}
   781	
   782	/* Patched to NOP when enabled */
 > 783	void noinstr spectre_bhb_patch_fw_mitigation_enabled(struct alt_instr *alt,

-- 
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https://01.org/lkp