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Sun, 12 Nov 2023 17:54:45 +0000 Date: Mon, 13 Nov 2023 01:54:18 +0800 From: kernel test robot To: Juergen Gross Cc: oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org, "Borislav Petkov (AMD)" Subject: arch/x86/kernel/cpu/mtrr/generic.c:259: warning: Function parameter or member 'var' not described in 'mtrr_overwrite_state' Message-ID: <202311130104.9xKAKzke-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Juergen, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 1b907d0507354b74a4f2c286380cd6059af79248 commit: 29055dc74287467bd7a053d60b4afe753832960d x86/mtrr: Support setting MTRR state for software defined MTRRs date: 5 months ago config: i386-allnoconfig (https://download.01.org/0day-ci/archive/20231113/202311130104.9xKAKzke-lkp@intel.com/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231113/202311130104.9xKAKzke-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/202311130104.9xKAKzke-lkp@intel.com/ All warnings (new ones prefixed by >>): arch/x86/kernel/cpu/mtrr/generic.c:125: warning: Function parameter or member 'start' not described in 'mtrr_type_lookup_fixed' arch/x86/kernel/cpu/mtrr/generic.c:125: warning: Function parameter or member 'end' not described in 'mtrr_type_lookup_fixed' arch/x86/kernel/cpu/mtrr/generic.c:166: warning: Function parameter or member 'start' not described in 'mtrr_type_lookup_variable' arch/x86/kernel/cpu/mtrr/generic.c:166: warning: Function parameter or member 'end' not described in 'mtrr_type_lookup_variable' arch/x86/kernel/cpu/mtrr/generic.c:166: warning: Function parameter or member 'partial_end' not described in 'mtrr_type_lookup_variable' arch/x86/kernel/cpu/mtrr/generic.c:166: warning: Function parameter or member 'repeat' not described in 'mtrr_type_lookup_variable' arch/x86/kernel/cpu/mtrr/generic.c:166: warning: Function parameter or member 'uniform' not described in 'mtrr_type_lookup_variable' >> arch/x86/kernel/cpu/mtrr/generic.c:259: warning: Function parameter or member 'var' not described in 'mtrr_overwrite_state' >> arch/x86/kernel/cpu/mtrr/generic.c:259: warning: Function parameter or member 'num_var' not described in 'mtrr_overwrite_state' >> arch/x86/kernel/cpu/mtrr/generic.c:259: warning: Function parameter or member 'def_type' not described in 'mtrr_overwrite_state' arch/x86/kernel/cpu/mtrr/generic.c:316: warning: Function parameter or member 'start' not described in 'mtrr_type_lookup' arch/x86/kernel/cpu/mtrr/generic.c:316: warning: Function parameter or member 'end' not described in 'mtrr_type_lookup' arch/x86/kernel/cpu/mtrr/generic.c:316: warning: Function parameter or member 'uniform' not described in 'mtrr_type_lookup' vim +259 arch/x86/kernel/cpu/mtrr/generic.c 246 247 /** 248 * mtrr_overwrite_state - set static MTRR state 249 * 250 * Used to set MTRR state via different means (e.g. with data obtained from 251 * a hypervisor). 252 * Is allowed only for special cases when running virtualized. Must be called 253 * from the x86_init.hyper.init_platform() hook. It can be called only once. 254 * The MTRR state can't be changed afterwards. To ensure that, X86_FEATURE_MTRR 255 * is cleared. 256 */ 257 void mtrr_overwrite_state(struct mtrr_var_range *var, unsigned int num_var, 258 mtrr_type def_type) > 259 { 260 unsigned int i; 261 262 /* Only allowed to be called once before mtrr_bp_init(). */ 263 if (WARN_ON_ONCE(mtrr_state_set)) 264 return; 265 266 /* Only allowed when running virtualized. */ 267 if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) 268 return; 269 270 /* 271 * Only allowed for special virtualization cases: 272 * - when running as Hyper-V, SEV-SNP guest using vTOM 273 * - when running as Xen PV guest 274 * - when running as SEV-SNP or TDX guest to avoid unnecessary 275 * VMM communication/Virtualization exceptions (#VC, #VE) 276 */ 277 if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP) && 278 !hv_is_isolation_supported() && 279 !cpu_feature_enabled(X86_FEATURE_XENPV) && 280 !cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) 281 return; 282 283 /* Disable MTRR in order to disable MTRR modifications. */ 284 setup_clear_cpu_cap(X86_FEATURE_MTRR); 285 286 if (var) { 287 if (num_var > MTRR_MAX_VAR_RANGES) { 288 pr_warn("Trying to overwrite MTRR state with %u variable entries\n", 289 num_var); 290 num_var = MTRR_MAX_VAR_RANGES; 291 } 292 for (i = 0; i < num_var; i++) 293 mtrr_state.var_ranges[i] = var[i]; 294 num_var_ranges = num_var; 295 } 296 297 mtrr_state.def_type = def_type; 298 mtrr_state.enabled |= MTRR_STATE_MTRR_ENABLED; 299 300 mtrr_state_set = 1; 301 } 302 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki