CC: [email protected] CC: [email protected] TO: Will Deacon <[email protected]>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 61556703b610a104de324e4f061dc6cf7b218b46 commit: dee081bf8f824cabeb7c7495367d5dad0a444eb1 READ_ONCE: Drop pointer qualifiers when reading from scalar types date: 10 months ago :::::: branch date: 3 days ago :::::: commit date: 10 months ago config: microblaze-randconfig-s032-20210207 (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: v0.6.3-215-g0fb77bb6-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dee081bf8f824cabeb7c7495367d5dad0a444eb1 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout dee081bf8f824cabeb7c7495367d5dad0a444eb1 # 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 <[email protected]> "sparse warnings: (new ones prefixed by >>)" drivers/block/zram/zram_drv.c: note: in included file (through include/linux/list_bl.h, include/linux/rculist_bl.h, include/linux/dcache.h, ...): include/linux/bit_spinlock.h:41:19: sparse: sparse: context imbalance in 'zram_slot_trylock' - different lock contexts for basic block drivers/block/zram/zram_drv.c: note: in included file (through include/asm-generic/bitops.h, arch/microblaze/include/generated/asm/bitops.h, include/linux/bitops.h, ...): >> include/asm-generic/bitops/lock.h:28:43: sparse: sparse: context imbalance >> in 'zram_slot_lock' - wrong count at exit drivers/block/zram/zram_drv.c: note: in included file (through include/linux/list_bl.h, include/linux/rculist_bl.h, include/linux/dcache.h, ...): include/linux/bit_spinlock.h:63:25: sparse: sparse: context imbalance in 'zram_slot_unlock' - unexpected unlock vim +/zram_slot_lock +28 include/asm-generic/bitops/lock.h 84c6591103dbea Will Deacon 2018-06-19 8 26333576fd0d0b Nick Piggin 2007-10-18 9 /** 26333576fd0d0b Nick Piggin 2007-10-18 10 * test_and_set_bit_lock - Set a bit and return its old value, for lock 26333576fd0d0b Nick Piggin 2007-10-18 11 * @nr: Bit to set 26333576fd0d0b Nick Piggin 2007-10-18 12 * @addr: Address to count from 26333576fd0d0b Nick Piggin 2007-10-18 13 * 61e02392d3c7ec Will Deacon 2018-02-13 14 * This operation is atomic and provides acquire barrier semantics if 61e02392d3c7ec Will Deacon 2018-02-13 15 * the returned value is 0. 26333576fd0d0b Nick Piggin 2007-10-18 16 * It can be used to implement bit locks. 26333576fd0d0b Nick Piggin 2007-10-18 17 */ 84c6591103dbea Will Deacon 2018-06-19 18 static inline int test_and_set_bit_lock(unsigned int nr, 84c6591103dbea Will Deacon 2018-06-19 19 volatile unsigned long *p) 84c6591103dbea Will Deacon 2018-06-19 20 { 84c6591103dbea Will Deacon 2018-06-19 21 long old; 84c6591103dbea Will Deacon 2018-06-19 22 unsigned long mask = BIT_MASK(nr); 84c6591103dbea Will Deacon 2018-06-19 23 84c6591103dbea Will Deacon 2018-06-19 24 p += BIT_WORD(nr); 84c6591103dbea Will Deacon 2018-06-19 25 if (READ_ONCE(*p) & mask) 84c6591103dbea Will Deacon 2018-06-19 26 return 1; 84c6591103dbea Will Deacon 2018-06-19 27 84c6591103dbea Will Deacon 2018-06-19 @28 old = atomic_long_fetch_or_acquire(mask, (atomic_long_t *)p); 84c6591103dbea Will Deacon 2018-06-19 29 return !!(old & mask); 84c6591103dbea Will Deacon 2018-06-19 30 } 84c6591103dbea Will Deacon 2018-06-19 31 :::::: The code at line 28 was first introduced by commit :::::: 84c6591103dbeaf393a092a3fc7b09510825f6b9 locking/atomics, asm-generic/bitops/lock.h: Rewrite using atomic_fetch_*() :::::: TO: Will Deacon <[email protected]> :::::: CC: Ingo Molnar <[email protected]> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/[email protected]
.config.gz
Description: application/gzip
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