From: kernel test robot <lkp@intel.com>
To: Dave Marchevsky <davemarchevsky@fb.com>
Cc: oe-kbuild-all@lists.linux.dev,
Linux Memory Management List <linux-mm@kvack.org>,
Alexei Starovoitov <ast@kernel.org>
Subject: [linux-next:master 2424/8441] arch/alpha/include/asm/xchg.h:234:32: sparse: sparse: cast truncates bits from constant value (eb9f becomes 9f)
Date: Thu, 10 Aug 2023 01:07:19 +0800 [thread overview]
Message-ID: <202308100149.2rvEPRIG-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: 21ef7b1e17d039053edaeaf41142423810572741
commit: c3c510ce431cd99fa10dcd50d995c8e89330ee5b [2424/8441] bpf: Add 'owner' field to bpf_{list,rb}_node
config: alpha-randconfig-r093-20230809 (https://download.01.org/0day-ci/archive/20230810/202308100149.2rvEPRIG-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230810/202308100149.2rvEPRIG-lkp@intel.com/reproduce)
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/202308100149.2rvEPRIG-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
kernel/bpf/helpers.c: note: in included file (through arch/alpha/include/asm/cmpxchg.h, arch/alpha/include/asm/atomic.h, include/linux/atomic.h, ...):
>> arch/alpha/include/asm/xchg.h:234:32: sparse: sparse: cast truncates bits from constant value (eb9f becomes 9f)
>> arch/alpha/include/asm/xchg.h:234:32: sparse: sparse: cast truncates bits from constant value (eb9f becomes 9f)
kernel/bpf/helpers.c:2419:18: sparse: sparse: context imbalance in 'bpf_rcu_read_lock' - wrong count at exit
kernel/bpf/helpers.c:2424:18: sparse: sparse: context imbalance in 'bpf_rcu_read_unlock' - unexpected unlock
vim +234 arch/alpha/include/asm/xchg.h
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 227
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 228 static __always_inline unsigned long
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 229 ____cmpxchg(, volatile void *ptr, unsigned long old, unsigned long new,
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 230 int size)
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 231 {
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 232 switch (size) {
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 233 case 1:
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 @234 return ____cmpxchg(_u8, ptr, old, new);
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 235 case 2:
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 236 return ____cmpxchg(_u16, ptr, old, new);
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 237 case 4:
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 238 return ____cmpxchg(_u32, ptr, old, new);
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 239 case 8:
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 240 return ____cmpxchg(_u64, ptr, old, new);
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 241 }
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 242 __cmpxchg_called_with_bad_pointer();
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 243 return old;
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 244 }
a6209d6d71f2ab Ivan Kokshaysky 2009-03-31 245
:::::: The code at line 234 was first introduced by commit
:::::: a6209d6d71f2ab8c63cc1587ef65490d83022baf alpha: xchg/cmpxchg cleanup and fixes
:::::: TO: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
reply other threads:[~2023-08-09 17:07 UTC|newest]
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