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Date: Wed, 1 Mar 2023 15:48:27 +0800
From: kernel test robot <lkp@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: oe-kbuild-all@lists.linux.dev, Ammar Faizi <ammarfaizi2@gnuweeb.org>,
GNU/Weeb Mailing List <gwml@vger.gnuweeb.org>
Subject: [ammarfaizi2-block:tglx/devel/rcuref 2/3]
arch/sparc/include/asm/cmpxchg_64.h:161:55: sparse: sparse: cast truncates
bits from constant value (ffffffffe0000000 becomes 0)
Message-ID: <202303011547.O2cOhQQe-lkp@intel.com>
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tree: https://github.com/ammarfaizi2/linux-block tglx/devel/rcuref
head: 9dcf0830de36103b3a5ed2bdd1bfa5cbcc1032d8
commit: 212b3a6f7d18535cb6b745193608bf2ffaf111b9 [2/3] atomics: Provide rcuref - scalable reference counting
config: sparc64-randconfig-s051-20230226 (https://download.01.org/0day-ci/archive/20230301/202303011547.O2cOhQQe-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 12.1.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-39-gce1a6720-dirty
# https://github.com/ammarfaizi2/linux-block/commit/212b3a6f7d18535cb6b745193608bf2ffaf111b9
git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
git fetch --no-tags ammarfaizi2-block tglx/devel/rcuref
git checkout 212b3a6f7d18535cb6b745193608bf2ffaf111b9
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc64 olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc64 SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303011547.O2cOhQQe-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
lib/rcuref.c: note: in included file (through arch/sparc/include/asm/cmpxchg.h, arch/sparc/include/asm/atomic_64.h, arch/sparc/include/asm/atomic.h, ...):
>> arch/sparc/include/asm/cmpxchg_64.h:161:55: sparse: sparse: cast truncates bits from constant value (ffffffffe0000000 becomes 0)
vim +161 arch/sparc/include/asm/cmpxchg_64.h
d550bbd40c0e10 David Howells 2012-03-28 155
d550bbd40c0e10 David Howells 2012-03-28 156 static inline unsigned long
d550bbd40c0e10 David Howells 2012-03-28 157 __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
d550bbd40c0e10 David Howells 2012-03-28 158 {
d550bbd40c0e10 David Howells 2012-03-28 159 switch (size) {
a12ee2349312d7 Babu Moger 2017-05-24 160 case 1:
a12ee2349312d7 Babu Moger 2017-05-24 @161 return __cmpxchg_u8(ptr, old, new);
d550bbd40c0e10 David Howells 2012-03-28 162 case 4:
d550bbd40c0e10 David Howells 2012-03-28 163 return __cmpxchg_u32(ptr, old, new);
d550bbd40c0e10 David Howells 2012-03-28 164 case 8:
d550bbd40c0e10 David Howells 2012-03-28 165 return __cmpxchg_u64(ptr, old, new);
d550bbd40c0e10 David Howells 2012-03-28 166 }
d550bbd40c0e10 David Howells 2012-03-28 167 __cmpxchg_called_with_bad_pointer();
d550bbd40c0e10 David Howells 2012-03-28 168 return old;
d550bbd40c0e10 David Howells 2012-03-28 169 }
d550bbd40c0e10 David Howells 2012-03-28 170
:::::: The code at line 161 was first introduced by commit
:::::: a12ee2349312d7112b9b7c6ac2e70c5ec2ca334e arch/sparc: Introduce cmpxchg_u8 SPARC
:::::: TO: Babu Moger <babu.moger@oracle.com>
:::::: CC: David S. Miller <davem@davemloft.net>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests