CC: kbuild-...@lists.01.org BCC: l...@intel.com CC: Linux Memory Management List <linux...@kvack.org> TO: "Jason A. Donenfeld" <zx...@kernel.org>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 75d7bf5eae277f32dd952276aa41ae7915dba1b2 commit: 2d29184c1c10466b4c15e99d4776e99c06d930e4 [8395/8513] random: remove "nordrand" flag in favor of "random.trust_cpu" :::::: branch date: 11 hours ago :::::: commit date: 20 hours ago config: x86_64-randconfig-m001 (https://download.01.org/0day-ci/archive/20220708/202207080455.fbxfqpiq-...@intel.com/config) compiler: gcc-11 (Debian 11.3.0-3) 11.3.0 If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <l...@intel.com> Reported-by: Dan Carpenter <dan.carpen...@oracle.com> New smatch warnings: arch/x86/kernel/cpu/rdrand.c:36 x86_init_rdrand() error: uninitialized symbol 'prev'. Old smatch warnings: arch/x86/kernel/cpu/rdrand.c:49 x86_init_rdrand() error: uninitialized symbol 'prev'. vim +/prev +36 arch/x86/kernel/cpu/rdrand.c 49d859d78c5aeb9 H. Peter Anvin 2011-07-31 13 49d859d78c5aeb9 H. Peter Anvin 2011-07-31 14 /* 0007bccc3cfd1e6 Len Brown 2015-08-16 15 * RDRAND has Built-In-Self-Test (BIST) that runs on every invocation. 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 16 * Run the instruction a few times as a sanity check. Also make sure 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 17 * it's not outputting the same value over and over, which has happened 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 18 * as a result of past CPU bugs. 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 19 * 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 20 * If it fails, it is simple to disable RDRAND and RDSEED here. 49d859d78c5aeb9 H. Peter Anvin 2011-07-31 21 */ 49d859d78c5aeb9 H. Peter Anvin 2011-07-31 22 148f9bb87745ed4 Paul Gortmaker 2013-06-18 23 void x86_init_rdrand(struct cpuinfo_x86 *c) 49d859d78c5aeb9 H. Peter Anvin 2011-07-31 24 { 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 25 enum { SAMPLES = 8, MIN_CHANGE = 5 }; 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 26 unsigned long sample, prev; 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 27 bool failure = false; 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 28 size_t i, changed; 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 29 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 30 if (cpu_has(c, X86_FEATURE_RDRAND)) { 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 31 for (changed = 0, i = 0; i < SAMPLES; ++i) { 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 32 if (!rdrand_long(&sample)) { 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 33 failure = true; 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 34 break; 0007bccc3cfd1e6 Len Brown 2015-08-16 35 } 2d29184c1c10466 Jason A. Donenfeld 2022-07-05 @36 changed += i && sample != prev; -- 0-DAY CI Kernel Test Service https://01.org/lkp _______________________________________________ kbuild mailing list -- kbuild@lists.01.org To unsubscribe send an email to kbuild-le...@lists.01.org
