From: kernel test robot <lkp@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: kernel/futex/core.c:1748:2-8: WARNING: NULL check before some freeing functions is not needed.
Date: Mon, 02 Feb 2026 10:05:00 +0800 [thread overview]
Message-ID: <202602021017.JuULzLgI-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 18f7fcd5e69a04df57b563360b88be72471d6b62
commit: 56180dd20c19e5b0fa34822997a9ac66b517e7b3 futex: Use RCU-based per-CPU reference counting instead of rcuref_t
date: 7 months ago
config: x86_64-randconfig-r061-20260201 (https://download.01.org/0day-ci/archive/20260202/202602021017.JuULzLgI-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602021017.JuULzLgI-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 <bigeasy@linutronix.de>
:::::: CC: Peter Zijlstra <peterz@infradead.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next reply other threads:[~2026-02-02 2:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-02 2:05 kernel test robot [this message]
-- strict thread matches above, loose matches on Subject: below --
2026-03-23 19:41 kernel/futex/core.c:1748:2-8: WARNING: NULL check before some freeing functions is not needed kernel test robot
2026-02-01 16:39 kernel test robot
2025-12-22 13:50 kernel test robot
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