arch/powerpc/perf/core-book3s.c:2474:10: warning: Using pointer that is a temporary. [danglingTemporaryLifetime]

arch/powerpc/perf/core-book3s.c:2474:10: warning: Using pointer that is a temporary. [danglingTemporaryLifetime]

[kernel test robot]

:::::: 
:::::: Manual check reason: "low confidence static check warning: arch/powerpc/perf/core-book3s.c:2474:10: warning: Using pointer that is a temporary. [danglingTemporaryLifetime]"
:::::: 

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
CC: Michael Ellerman <mpe@ellerman.id.au>
CC: Nicholas Piggin <npiggin@gmail.com>

Hi Athira,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f67dd6ce0723ad013395f20a3f79d8a437d3f455
commit: 429a64f6e91fbfe4912d17247c27d0d66767b1c2 powerpc/perf: Only define power_pmu_wants_prompt_pmi() for CONFIG_PPC64
date:   10 months ago
:::::: branch date: 16 hours ago
:::::: commit date: 10 months ago
compiler: powerpc-linux-gcc (GCC) 12.1.0
reproduce (cppcheck warning):
        # apt-get install cppcheck
        git checkout 429a64f6e91fbfe4912d17247c27d0d66767b1c2
        cppcheck --quiet --enable=style,performance,portability --template=gcc FILE

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>


cppcheck possible warnings: (new ones prefixed by >>, may not real problems)

>> arch/powerpc/perf/core-book3s.c:2474:10: warning: Using pointer that is a temporary. [danglingTemporaryLifetime]
     memset(cpuhw, 0, sizeof(*cpuhw));
            ^
   arch/powerpc/perf/core-book3s.c:2471:32: note: Address of variable taken here.
    struct cpu_hw_events *cpuhw = &per_cpu(cpu_hw_events, cpu);
                                  ^
   arch/powerpc/perf/core-book3s.c:2471:40: note: Temporary created here.
    struct cpu_hw_events *cpuhw = &per_cpu(cpu_hw_events, cpu);
                                          ^
   arch/powerpc/perf/core-book3s.c:2474:10: note: Using pointer that is a temporary.
     memset(cpuhw, 0, sizeof(*cpuhw));
            ^
   arch/powerpc/perf/core-book3s.c:2475:3: warning: Using pointer that is a temporary. [danglingTemporaryLifetime]
     cpuhw->mmcr.mmcr0 = MMCR0_FC;
     ^
   arch/powerpc/perf/core-book3s.c:2471:32: note: Address of variable taken here.
    struct cpu_hw_events *cpuhw = &per_cpu(cpu_hw_events, cpu);
                                  ^
   arch/powerpc/perf/core-book3s.c:2471:40: note: Temporary created here.
    struct cpu_hw_events *cpuhw = &per_cpu(cpu_hw_events, cpu);
                                          ^
   arch/powerpc/perf/core-book3s.c:2475:3: note: Using pointer that is a temporary.
     cpuhw->mmcr.mmcr0 = MMCR0_FC;
     ^
>> arch/powerpc/perf/core-book3s.c:1331:62: warning: Operator '|' with one operand equal to zero is redundant. [badBitmaskCheck]
     val &= ~(MMCR0_EBE | MMCR0_BHRBA | MMCR0_PMCC | MMCR0_PMAO |
                                                                ^

vim +2474 arch/powerpc/perf/core-book3s.c

0c9108b0837063 arch/powerpc/perf/core-book3s.c    Ravi Bangoria   2018-11-21  2468  
7c98bd72081c44 arch/powerpc/perf/core-book3s.c    Daniel Axtens   2016-09-06  2469  static int power_pmu_prepare_cpu(unsigned int cpu)
01d0287f068de2 arch/powerpc/kernel/perf_counter.c Paul Mackerras  2009-01-14  2470  {
cdd6c482c9ff9c arch/powerpc/kernel/perf_event.c   Ingo Molnar     2009-09-21  2471  	struct cpu_hw_events *cpuhw = &per_cpu(cpu_hw_events, cpu);
01d0287f068de2 arch/powerpc/kernel/perf_counter.c Paul Mackerras  2009-01-14  2472  
57ecde42cc7493 arch/powerpc/perf/core-book3s.c    Thomas Gleixner 2016-07-13  2473  	if (ppmu) {
01d0287f068de2 arch/powerpc/kernel/perf_counter.c Paul Mackerras  2009-01-14 @2474  		memset(cpuhw, 0, sizeof(*cpuhw));
78d76819e6f046 arch/powerpc/perf/core-book3s.c    Athira Rajeev   2020-07-17  2475  		cpuhw->mmcr.mmcr0 = MMCR0_FC;
01d0287f068de2 arch/powerpc/kernel/perf_counter.c Paul Mackerras  2009-01-14  2476  	}
57ecde42cc7493 arch/powerpc/perf/core-book3s.c    Thomas Gleixner 2016-07-13  2477  	return 0;
3f6da390539882 arch/powerpc/kernel/perf_event.c   Peter Zijlstra  2010-03-05  2478  }
3f6da390539882 arch/powerpc/kernel/perf_event.c   Peter Zijlstra  2010-03-05  2479  

:::::: The code at line 2474 was first introduced by commit
:::::: 01d0287f068de2934109ba9b989d8807526cccc2 powerpc/perf_counter: Make sure PMU gets enabled properly

:::::: TO: Paul Mackerras <paulus@samba.org>
:::::: CC: Paul Mackerras <paulus@samba.org>

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