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linux-kernel@vger.kernel.org, Peter Zijlstra Subject: include/asm-generic/cmpxchg.h:37:39: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) Message-ID: <202201011813.hKjzPzZI-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 8008293888188c3923f5bd8a69370dae25ed14e5 commit: c7178cdecdbef8321f418fac55f3afaca3bb4c96 locking/atomic: h8300: use asm-generic exclusively date: 7 months ago config: h8300-randconfig-s031-20211117 (https://download.01.org/0day-ci/archive/20220101/202201011813.hKjzPzZI-lkp@intel.com/config) compiler: h8300-linux-gcc (GCC) 11.2.0 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-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c7178cdecdbef8321f418fac55f3afaca3bb4c96 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout c7178cdecdbef8321f418fac55f3afaca3bb4c96 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=h8300 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot sparse warnings: (new ones prefixed by >>) lib/atomic64_test.c: note: in included file (through arch/h8300/include/generated/asm/cmpxchg.h, include/asm-generic/atomic.h, arch/h8300/include/generated/asm/atomic.h, ...): >> include/asm-generic/cmpxchg.h:37:39: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) >> include/asm-generic/cmpxchg.h:48:40: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg.h:37:39: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) >> include/asm-generic/cmpxchg.h:48:40: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg.h:37:39: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) >> include/asm-generic/cmpxchg.h:48:40: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg.h:37:39: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) >> include/asm-generic/cmpxchg.h:48:40: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) lib/atomic64_test.c: note: in included file (through include/asm-generic/cmpxchg.h, arch/h8300/include/generated/asm/cmpxchg.h, include/asm-generic/atomic.h, ...): >> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) >> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) >> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) >> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) >> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) >> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) >> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) >> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) >> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) vim +37 include/asm-generic/cmpxchg.h b4816afa398670 David Howells 2012-03-28 24 b4816afa398670 David Howells 2012-03-28 25 static inline b4816afa398670 David Howells 2012-03-28 26 unsigned long __xchg(unsigned long x, volatile void *ptr, int size) b4816afa398670 David Howells 2012-03-28 27 { b4816afa398670 David Howells 2012-03-28 28 unsigned long ret, flags; b4816afa398670 David Howells 2012-03-28 29 b4816afa398670 David Howells 2012-03-28 30 switch (size) { b4816afa398670 David Howells 2012-03-28 31 case 1: b4816afa398670 David Howells 2012-03-28 32 #ifdef __xchg_u8 b4816afa398670 David Howells 2012-03-28 33 return __xchg_u8(x, ptr); b4816afa398670 David Howells 2012-03-28 34 #else b4816afa398670 David Howells 2012-03-28 35 local_irq_save(flags); b4816afa398670 David Howells 2012-03-28 36 ret = *(volatile u8 *)ptr; b4816afa398670 David Howells 2012-03-28 @37 *(volatile u8 *)ptr = x; b4816afa398670 David Howells 2012-03-28 38 local_irq_restore(flags); b4816afa398670 David Howells 2012-03-28 39 return ret; b4816afa398670 David Howells 2012-03-28 40 #endif /* __xchg_u8 */ b4816afa398670 David Howells 2012-03-28 41 b4816afa398670 David Howells 2012-03-28 42 case 2: b4816afa398670 David Howells 2012-03-28 43 #ifdef __xchg_u16 b4816afa398670 David Howells 2012-03-28 44 return __xchg_u16(x, ptr); b4816afa398670 David Howells 2012-03-28 45 #else b4816afa398670 David Howells 2012-03-28 46 local_irq_save(flags); b4816afa398670 David Howells 2012-03-28 47 ret = *(volatile u16 *)ptr; b4816afa398670 David Howells 2012-03-28 @48 *(volatile u16 *)ptr = x; b4816afa398670 David Howells 2012-03-28 49 local_irq_restore(flags); b4816afa398670 David Howells 2012-03-28 50 return ret; b4816afa398670 David Howells 2012-03-28 51 #endif /* __xchg_u16 */ b4816afa398670 David Howells 2012-03-28 52 b4816afa398670 David Howells 2012-03-28 53 case 4: b4816afa398670 David Howells 2012-03-28 54 #ifdef __xchg_u32 b4816afa398670 David Howells 2012-03-28 55 return __xchg_u32(x, ptr); b4816afa398670 David Howells 2012-03-28 56 #else b4816afa398670 David Howells 2012-03-28 57 local_irq_save(flags); b4816afa398670 David Howells 2012-03-28 58 ret = *(volatile u32 *)ptr; b4816afa398670 David Howells 2012-03-28 59 *(volatile u32 *)ptr = x; b4816afa398670 David Howells 2012-03-28 60 local_irq_restore(flags); b4816afa398670 David Howells 2012-03-28 61 return ret; b4816afa398670 David Howells 2012-03-28 62 #endif /* __xchg_u32 */ b4816afa398670 David Howells 2012-03-28 63 :::::: The code at line 37 was first introduced by commit :::::: b4816afa3986704d1404fc48e931da5135820472 Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h :::::: TO: David Howells :::::: CC: David Howells --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org