linux-kernel - [stable:linux-5.15.y 7794/8135] arch/x86/kernel/cpu/bugs.o: warning: objtool: spectre_v2_select_mitigation()+0x4f: unreachable instruction

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Message-ID: <202207042208.OqZ0kslF-lkp@intel.com>
Date:   Mon, 4 Jul 2022 22:54:29 +0800
From:   kernel test robot <lkp@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [stable:linux-5.15.y 7794/8135] arch/x86/kernel/cpu/bugs.o: warning:
 objtool: spectre_v2_select_mitigation()+0x4f: unreachable instruction

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-5.15.y
head:   545aecd229613138d6db54fb2b5221faca10137f
commit: 0853f905e48b92dcf27a8d931104c9aac10de191 [7794/8135] x86/cpu: Elide KCSAN for cpu_has() and friends
config: x86_64-randconfig-a004-20220704
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=0853f905e48b92dcf27a8d931104c9aac10de191
        git remote add stable https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
        git fetch --no-tags stable linux-5.15.y
        git checkout 0853f905e48b92dcf27a8d931104c9aac10de191
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/

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/x86/kernel/cpu/bugs.o: warning: objtool: spectre_v2_select_mitigation()+0x4f: unreachable instruction

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

View attachment "config" of type "text/plain" (129579 bytes)