From: kernel test robot <yujie.liu@intel.com> To: "Steven Rostedt (VMware)" <rostedt@goodmis.org> Cc: <llvm@lists.linux.dev>, <kbuild-all@lists.01.org>, "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org> Subject: [rostedt-trace:ftrace/core 2/2] kernel/trace/pid_list.c:439:6: warning: Branch condition evaluates to a garbage value [clang-analyzer-core.uninitialized.Branch] Date: Sun, 10 Oct 2021 17:46:20 +0800 [thread overview] Message-ID: <aa487fb0-6e7a-451d-b534-9c8aca2ca39b@intel.com> (raw) In-Reply-To: <202109300520.e7Cli09Z-lkp@intel.com> [-- Attachment #1: Type: text/plain, Size: 9204 bytes --] tree: https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git ftrace/core head: c8d01c02b46e599b057d7d24d1342ae9fcf828c2 commit: c8d01c02b46e599b057d7d24d1342ae9fcf828c2 [2/2] tracing: Create a sparse bitmask for pid filtering config: riscv-randconfig-c006-20210927 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dc6e8dfdfe7efecfda318d43a06fae18b40eb498) 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 # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git/commit/?id=c8d01c02b46e599b057d7d24d1342ae9fcf828c2 git remote add rostedt-trace https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git git fetch --no-tags rostedt-trace ftrace/core git checkout c8d01c02b46e599b057d7d24d1342ae9fcf828c2 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv clang-analyzer If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com> clang-analyzer warnings: (new ones prefixed by >>) >> kernel/trace/pid_list.c:439:6: warning: Branch condition evaluates to a garbage value [clang-analyzer-core.uninitialized.Branch] if (upper) { ^~~~~ kernel/trace/pid_list.c:398:2: note: 'upper' declared without an initial value union upper_chunk *upper; ^~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/pid_list.c:413:6: note: Assuming 'upper_count' is > 0 if (upper_count <= 0 && lower_count <= 0) ^~~~~~~~~~~~~~~~ kernel/trace/pid_list.c:413:23: note: Left side of '&&' is false if (upper_count <= 0 && lower_count <= 0) ^ kernel/trace/pid_list.c:416:2: note: Loop condition is true. Entering loop body while (upper_count-- > 0) { ^ kernel/trace/pid_list.c:420:7: note: Assuming 'chunk' is null if (!chunk) ^~~~~~ kernel/trace/pid_list.c:420:3: note: Taking true branch if (!chunk) ^ kernel/trace/pid_list.c:421:4: note: Execution continues on line 427 break; ^ kernel/trace/pid_list.c:427:9: note: Assuming the condition is false while (lower_count-- > 0) { ^~~~~~~~~~~~~~~~~ kernel/trace/pid_list.c:427:2: note: Loop condition is false. Execution continues on line 438 while (lower_count-- > 0) { ^ kernel/trace/pid_list.c:439:6: note: Branch condition evaluates to a garbage value if (upper) { ^~~~~ kernel/trace/pid_list.c:444:6: warning: Branch condition evaluates to a garbage value [clang-analyzer-core.uninitialized.Branch] if (lower) { ^~~~~ vim +439 kernel/trace/pid_list.c c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 393) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 394) static void pid_list_refill_irq(struct irq_work *iwork) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 395) { c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 396) struct trace_pid_list *pid_list = container_of(iwork, struct trace_pid_list, c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 397) refill_irqwork); c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 398) union upper_chunk *upper; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 399) union lower_chunk *lower; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 400) union upper_chunk **upper_next = &upper; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 401) union lower_chunk **lower_next = &lower; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 402) int upper_count; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 403) int lower_count; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 404) int ucnt = 0; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 405) int lcnt = 0; eff05923d317af7 Steven Rostedt (VMware 2021-09-23 406) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 407) again: c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 408) raw_spin_lock(&pid_list->lock); c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 409) upper_count = CHUNK_ALLOC - pid_list->free_upper_chunks; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 410) lower_count = CHUNK_ALLOC - pid_list->free_lower_chunks; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 411) raw_spin_unlock(&pid_list->lock); eff05923d317af7 Steven Rostedt (VMware 2021-09-23 412) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 413) if (upper_count <= 0 && lower_count <= 0) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 414) return; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 415) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 416) while (upper_count-- > 0) { c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 417) union upper_chunk *chunk; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 418) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 419) chunk = kzalloc(sizeof(*chunk), GFP_KERNEL); c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 420) if (!chunk) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 421) break; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 422) *upper_next = chunk; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 423) upper_next = &chunk->next; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 424) ucnt++; eff05923d317af7 Steven Rostedt (VMware 2021-09-23 425) } c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 426) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 427) while (lower_count-- > 0) { c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 428) union lower_chunk *chunk; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 429) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 430) chunk = kzalloc(sizeof(*chunk), GFP_KERNEL); c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 431) if (!chunk) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 432) break; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 433) *lower_next = chunk; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 434) lower_next = &chunk->next; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 435) lcnt++; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 436) } c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 437) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 438) raw_spin_lock(&pid_list->lock); c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 @439) if (upper) { c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 440) *upper_next = pid_list->upper_list; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 441) pid_list->upper_list = upper; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 442) pid_list->free_upper_chunks += ucnt; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 443) } c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 444) if (lower) { c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 445) *lower_next = pid_list->lower_list; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 446) pid_list->lower_list = lower; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 447) pid_list->free_lower_chunks += lcnt; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 448) } c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 449) raw_spin_unlock(&pid_list->lock); c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 450) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 451) /* c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 452) * On success of allocating all the chunks, both counters c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 453) * will be less than zero. If they are not, then an allocation c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 454) * failed, and we should not try again. c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 455) */ c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 456) if (upper_count >= 0 || lower_count >= 0) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 457) return; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 458) /* c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 459) * When the locks were released, free chunks could have c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 460) * been used and allocation needs to be done again. Might as c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 461) * well allocate it now. c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 462) */ c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 463) goto again; eff05923d317af7 Steven Rostedt (VMware 2021-09-23 464) } eff05923d317af7 Steven Rostedt (VMware 2021-09-23 465) --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org [-- Attachment #2: .config.gz --] [-- Type: application/gzip, Size: 34157 bytes --]
WARNING: multiple messages have this Message-ID (diff)
From: kernel test robot <yujie.liu@intel.com> To: kbuild-all@lists.01.org Subject: [rostedt-trace:ftrace/core 2/2] kernel/trace/pid_list.c:439:6: warning: Branch condition evaluates to a garbage value [clang-analyzer-core.uninitialized.Branch] Date: Sun, 10 Oct 2021 17:46:20 +0800 [thread overview] Message-ID: <aa487fb0-6e7a-451d-b534-9c8aca2ca39b@intel.com> (raw) In-Reply-To: <202109300520.e7Cli09Z-lkp@intel.com> [-- Attachment #1: Type: text/plain, Size: 9346 bytes --] tree: https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git ftrace/core head: c8d01c02b46e599b057d7d24d1342ae9fcf828c2 commit: c8d01c02b46e599b057d7d24d1342ae9fcf828c2 [2/2] tracing: Create a sparse bitmask for pid filtering config: riscv-randconfig-c006-20210927 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dc6e8dfdfe7efecfda318d43a06fae18b40eb498) 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 # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git/commit/?id=c8d01c02b46e599b057d7d24d1342ae9fcf828c2 git remote add rostedt-trace https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git git fetch --no-tags rostedt-trace ftrace/core git checkout c8d01c02b46e599b057d7d24d1342ae9fcf828c2 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv clang-analyzer If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com> clang-analyzer warnings: (new ones prefixed by >>) >> kernel/trace/pid_list.c:439:6: warning: Branch condition evaluates to a garbage value [clang-analyzer-core.uninitialized.Branch] if (upper) { ^~~~~ kernel/trace/pid_list.c:398:2: note: 'upper' declared without an initial value union upper_chunk *upper; ^~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/pid_list.c:413:6: note: Assuming 'upper_count' is > 0 if (upper_count <= 0 && lower_count <= 0) ^~~~~~~~~~~~~~~~ kernel/trace/pid_list.c:413:23: note: Left side of '&&' is false if (upper_count <= 0 && lower_count <= 0) ^ kernel/trace/pid_list.c:416:2: note: Loop condition is true. Entering loop body while (upper_count-- > 0) { ^ kernel/trace/pid_list.c:420:7: note: Assuming 'chunk' is null if (!chunk) ^~~~~~ kernel/trace/pid_list.c:420:3: note: Taking true branch if (!chunk) ^ kernel/trace/pid_list.c:421:4: note: Execution continues on line 427 break; ^ kernel/trace/pid_list.c:427:9: note: Assuming the condition is false while (lower_count-- > 0) { ^~~~~~~~~~~~~~~~~ kernel/trace/pid_list.c:427:2: note: Loop condition is false. Execution continues on line 438 while (lower_count-- > 0) { ^ kernel/trace/pid_list.c:439:6: note: Branch condition evaluates to a garbage value if (upper) { ^~~~~ kernel/trace/pid_list.c:444:6: warning: Branch condition evaluates to a garbage value [clang-analyzer-core.uninitialized.Branch] if (lower) { ^~~~~ vim +439 kernel/trace/pid_list.c c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 393) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 394) static void pid_list_refill_irq(struct irq_work *iwork) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 395) { c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 396) struct trace_pid_list *pid_list = container_of(iwork, struct trace_pid_list, c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 397) refill_irqwork); c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 398) union upper_chunk *upper; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 399) union lower_chunk *lower; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 400) union upper_chunk **upper_next = &upper; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 401) union lower_chunk **lower_next = &lower; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 402) int upper_count; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 403) int lower_count; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 404) int ucnt = 0; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 405) int lcnt = 0; eff05923d317af7 Steven Rostedt (VMware 2021-09-23 406) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 407) again: c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 408) raw_spin_lock(&pid_list->lock); c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 409) upper_count = CHUNK_ALLOC - pid_list->free_upper_chunks; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 410) lower_count = CHUNK_ALLOC - pid_list->free_lower_chunks; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 411) raw_spin_unlock(&pid_list->lock); eff05923d317af7 Steven Rostedt (VMware 2021-09-23 412) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 413) if (upper_count <= 0 && lower_count <= 0) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 414) return; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 415) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 416) while (upper_count-- > 0) { c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 417) union upper_chunk *chunk; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 418) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 419) chunk = kzalloc(sizeof(*chunk), GFP_KERNEL); c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 420) if (!chunk) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 421) break; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 422) *upper_next = chunk; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 423) upper_next = &chunk->next; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 424) ucnt++; eff05923d317af7 Steven Rostedt (VMware 2021-09-23 425) } c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 426) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 427) while (lower_count-- > 0) { c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 428) union lower_chunk *chunk; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 429) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 430) chunk = kzalloc(sizeof(*chunk), GFP_KERNEL); c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 431) if (!chunk) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 432) break; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 433) *lower_next = chunk; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 434) lower_next = &chunk->next; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 435) lcnt++; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 436) } c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 437) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 438) raw_spin_lock(&pid_list->lock); c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 @439) if (upper) { c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 440) *upper_next = pid_list->upper_list; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 441) pid_list->upper_list = upper; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 442) pid_list->free_upper_chunks += ucnt; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 443) } c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 444) if (lower) { c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 445) *lower_next = pid_list->lower_list; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 446) pid_list->lower_list = lower; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 447) pid_list->free_lower_chunks += lcnt; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 448) } c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 449) raw_spin_unlock(&pid_list->lock); c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 450) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 451) /* c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 452) * On success of allocating all the chunks, both counters c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 453) * will be less than zero. If they are not, then an allocation c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 454) * failed, and we should not try again. c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 455) */ c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 456) if (upper_count >= 0 || lower_count >= 0) c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 457) return; c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 458) /* c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 459) * When the locks were released, free chunks could have c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 460) * been used and allocation needs to be done again. Might as c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 461) * well allocate it now. c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 462) */ c8d01c02b46e599 Steven Rostedt (VMware 2021-09-23 463) goto again; eff05923d317af7 Steven Rostedt (VMware 2021-09-23 464) } eff05923d317af7 Steven Rostedt (VMware 2021-09-23 465) --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org [-- Attachment #2: config.gz --] [-- Type: application/gzip, Size: 34157 bytes --]
next prev parent reply other threads:[~2021-10-10 9:46 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-09-29 21:19 [rostedt-trace:ftrace/core 2/2] kernel/trace/pid_list.c:439:6: warning: Branch condition evaluates to a garbage value [clang-analyzer-core.uninitialized.Branch] kernel test robot 2021-10-10 9:46 ` kernel test robot [this message] 2021-10-10 9:46 ` kernel test robot 2021-10-11 15:52 ` Steven Rostedt 2021-10-11 15:52 ` Steven Rostedt
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