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Message-ID: <202606041210.9DhsM1Gk-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: oe-kbuild-all@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: ba3e43a9e601636f5edb54e259a74f96ca3b8fd8 commit: 56180dd20c19e5b0fa34822997a9ac66b517e7b3 futex: Use RCU-based per-CPU reference counting instead of rcuref_t date: 11 months ago config: arm64-randconfig-r052-20260604 (https://download.01.org/0day-ci/archive/20260604/202606041210.9DhsM1Gk-lkp@intel.com/config) compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project e5ab4f8a1f766febdc65ce89c00dec85393cfd68) 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 | Fixes: 56180dd20c19 ("futex: Use RCU-based per-CPU reference counting instead of rcuref_t") | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202606041210.9DhsM1Gk-lkp@intel.com/ cocci warnings: (new ones prefixed by >>) >> kernel/futex/core.c:1748:2-8: WARNING: NULL check before some freeing functions is not needed. vim +1748 kernel/futex/core.c 56180dd20c19e5 Peter Zijlstra 2025-07-10 1739 80367ad01d93ac Sebastian Andrzej Siewior 2025-04-16 1740 void futex_hash_free(struct mm_struct *mm) 80367ad01d93ac Sebastian Andrzej Siewior 2025-04-16 1741 { bd54df5ea7cada Sebastian Andrzej Siewior 2025-04-16 1742 struct futex_private_hash *fph; bd54df5ea7cada Sebastian Andrzej Siewior 2025-04-16 1743 56180dd20c19e5 Peter Zijlstra 2025-07-10 1744 free_percpu(mm->futex_ref); bd54df5ea7cada Sebastian Andrzej Siewior 2025-04-16 1745 kvfree(mm->futex_phash_new); bd54df5ea7cada Sebastian Andrzej Siewior 2025-04-16 1746 fph = rcu_dereference_raw(mm->futex_phash); 56180dd20c19e5 Peter Zijlstra 2025-07-10 1747 if (fph) bd54df5ea7cada Sebastian Andrzej Siewior 2025-04-16 @1748 kvfree(fph); bd54df5ea7cada Sebastian Andrzej Siewior 2025-04-16 1749 } bd54df5ea7cada Sebastian Andrzej Siewior 2025-04-16 1750 :::::: The code at line 1748 was first introduced by commit :::::: bd54df5ea7cadac520e346d5f0fe5d58e635b6ba futex: Allow to resize the private local hash :::::: TO: Sebastian Andrzej Siewior :::::: CC: Peter Zijlstra -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki