[kbuild-all] arch/microblaze/include/asm/cmpxchg.h:19:50: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 1df0d8960499e58963fd6c8ac75e544f2b417b29 commit: 80591e61a0f7e88deaada69844e4a31280c4a38f kbuild: tell sparse about the $ARCH date: 8 months ago config: microblaze-randconfig-s031-20200711 (attached as .config) compiler: microblaze-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-37-gc9676a3b-dirty git checkout 80591e61a0f7e88deaada69844e4a31280c4a38f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=microblaze If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) 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 +19 arch/microblaze/include/asm/cmpxchg.h c40d04df152a11 David Howells 2012-03-28 8 c40d04df152a11 David Howells 2012-03-28 9 static inline unsigned long __xchg(unsigned long x, volatile void *ptr, c40d04df152a11 David Howells 2012-03-28 10 int size) c40d04df152a11 David Howells 2012-03-28 11 { c40d04df152a11 David Howells 2012-03-28 12 unsigned long ret; c40d04df152a11 David Howells 2012-03-28 13 unsigned long flags; c40d04df152a11 David Howells 2012-03-28 14 c40d04df152a11 David Howells 2012-03-28 15 switch (size) { c40d04df152a11 David Howells 2012-03-28 16 case 1: c40d04df152a11 David Howells 2012-03-28 17 local_irq_save(flags); c40d04df152a11 David Howells 2012-03-28 18 ret = *(volatile unsigned char *)ptr; c40d04df152a11 David Howells 2012-03-28 @19 *(volatile unsigned char *)ptr = x; c40d04df152a11 David Howells 2012-03-28 20 local_irq_restore(flags); c40d04df152a11 David Howells 2012-03-28 21 break; c40d04df152a11 David Howells 2012-03-28 22 c40d04df152a11 David Howells 2012-03-28 23 case 4: c40d04df152a11 David Howells 2012-03-28 24 local_irq_save(flags); c40d04df152a11 David Howells 2012-03-28 25 ret = *(volatile unsigned long *)ptr; c40d04df152a11 David Howells 2012-03-28 26 *(volatile unsigned long *)ptr = x; c40d04df152a11 David Howells 2012-03-28 27 local_irq_restore(flags); c40d04df152a11 David Howells 2012-03-28 28 break; c40d04df152a11 David Howells 2012-03-28 29 default: c40d04df152a11 David Howells 2012-03-28 30 __bad_xchg(ptr, size), ret = 0; c40d04df152a11 David Howells 2012-03-28 31 break; c40d04df152a11 David Howells 2012-03-28 32 } c40d04df152a11 David Howells 2012-03-28 33 c40d04df152a11 David Howells 2012-03-28 34 return ret; c40d04df152a11 David Howells 2012-03-28 35 } c40d04df152a11 David Howells 2012-03-28 36 :::::: The code at line 19 was first introduced by commit :::::: c40d04df152a1111c5bbcb632278394dabd2b73d Disintegrate asm/system.h for Microblaze :::::: TO: David Howells <dhowells(a)redhat.com&gt; :::::: CC: David Howells <dhowells(a)redhat.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org