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Peter Anvin" , Josh Poimboeuf , Sean Christopherson , Paolo Bonzini , Borislav Petkov , Dave Hansen Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Asit Mallick , Tao Zhang Subject: Re: [PATCH v5 4/9] x86/vmscape: Move mitigation selection to a switch() Message-ID: <202511270829.xMEXUXCW-lkp@intel.com> References: <20251126-vmscape-bhb-v5-4-02d66e423b00@linux.intel.com> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251126-vmscape-bhb-v5-4-02d66e423b00@linux.intel.com> Hi Pawan, kernel test robot noticed the following build warnings: [auto build test WARNING on 6a23ae0a96a600d1d12557add110e0bb6e32730c] url: https://github.com/intel-lab-lkp/linux/commits/Pawan-Gupta/x86-bhi-x86-vmscape-Move-LFENCE-out-of-clear_bhb_loop/20251127-061843 base: 6a23ae0a96a600d1d12557add110e0bb6e32730c patch link: https://lore.kernel.org/r/20251126-vmscape-bhb-v5-4-02d66e423b00%40linux.intel.com patch subject: [PATCH v5 4/9] x86/vmscape: Move mitigation selection to a switch() config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20251127/202511270829.xMEXUXCW-lkp@intel.com/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251127/202511270829.xMEXUXCW-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202511270829.xMEXUXCW-lkp@intel.com/ All warnings (new ones prefixed by >>): >> arch/x86/kernel/cpu/bugs.c:3260:2: warning: label at end of compound statement is a C23 extension [-Wc23-extensions] 3260 | } | ^ 1 warning generated. vim +3260 arch/x86/kernel/cpu/bugs.c 556c1ad666ad90 Pawan Gupta 2025-08-14 3231 556c1ad666ad90 Pawan Gupta 2025-08-14 3232 static void __init vmscape_select_mitigation(void) 556c1ad666ad90 Pawan Gupta 2025-08-14 3233 { 0091dd36e9ee51 Pawan Gupta 2025-11-26 3234 if (!boot_cpu_has_bug(X86_BUG_VMSCAPE)) { 556c1ad666ad90 Pawan Gupta 2025-08-14 3235 vmscape_mitigation = VMSCAPE_MITIGATION_NONE; 556c1ad666ad90 Pawan Gupta 2025-08-14 3236 return; 556c1ad666ad90 Pawan Gupta 2025-08-14 3237 } 556c1ad666ad90 Pawan Gupta 2025-08-14 3238 0091dd36e9ee51 Pawan Gupta 2025-11-26 3239 if ((vmscape_mitigation == VMSCAPE_MITIGATION_AUTO) && 0091dd36e9ee51 Pawan Gupta 2025-11-26 3240 !should_mitigate_vuln(X86_BUG_VMSCAPE)) 0091dd36e9ee51 Pawan Gupta 2025-11-26 3241 vmscape_mitigation = VMSCAPE_MITIGATION_NONE; 0091dd36e9ee51 Pawan Gupta 2025-11-26 3242 0091dd36e9ee51 Pawan Gupta 2025-11-26 3243 switch (vmscape_mitigation) { 0091dd36e9ee51 Pawan Gupta 2025-11-26 3244 case VMSCAPE_MITIGATION_NONE: 0091dd36e9ee51 Pawan Gupta 2025-11-26 3245 break; 0091dd36e9ee51 Pawan Gupta 2025-11-26 3246 0091dd36e9ee51 Pawan Gupta 2025-11-26 3247 case VMSCAPE_MITIGATION_IBPB_EXIT_TO_USER: 0091dd36e9ee51 Pawan Gupta 2025-11-26 3248 if (!boot_cpu_has(X86_FEATURE_IBPB)) 0091dd36e9ee51 Pawan Gupta 2025-11-26 3249 vmscape_mitigation = VMSCAPE_MITIGATION_NONE; 0091dd36e9ee51 Pawan Gupta 2025-11-26 3250 break; 0091dd36e9ee51 Pawan Gupta 2025-11-26 3251 0091dd36e9ee51 Pawan Gupta 2025-11-26 3252 case VMSCAPE_MITIGATION_AUTO: 0091dd36e9ee51 Pawan Gupta 2025-11-26 3253 if (boot_cpu_has(X86_FEATURE_IBPB)) 556c1ad666ad90 Pawan Gupta 2025-08-14 3254 vmscape_mitigation = VMSCAPE_MITIGATION_IBPB_EXIT_TO_USER; 5799d5d8a6c877 David Kaplan 2025-09-12 3255 else 5799d5d8a6c877 David Kaplan 2025-09-12 3256 vmscape_mitigation = VMSCAPE_MITIGATION_NONE; 0091dd36e9ee51 Pawan Gupta 2025-11-26 3257 break; 0091dd36e9ee51 Pawan Gupta 2025-11-26 3258 0091dd36e9ee51 Pawan Gupta 2025-11-26 3259 default: 5799d5d8a6c877 David Kaplan 2025-09-12 @3260 } 556c1ad666ad90 Pawan Gupta 2025-08-14 3261 } 556c1ad666ad90 Pawan Gupta 2025-08-14 3262 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki