tree: https://git.linaro.org/people/lee.jones/linux.git google/android-3.18-batch head: 4067e89d337bc9eff1775d036695028b3ea3487c commit: ba095f7a7a499fc213bfcf54a9eac7ba29837dac [202/521] pstore/ram: Use memcpy_toio instead of memcpy config: powerpc-randconfig-s031-20201230 (attached as .config) compiler: powerpc-linux-gcc (GCC) 5.5.0 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: v0.6.3-184-g1b896707-dirty git remote add lee-linaro https://git.linaro.org/people/lee.jones/linux.git git fetch --no-tags lee-linaro google/android-3.18-batch git checkout ba095f7a7a499fc213bfcf54a9eac7ba29837dac # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-5.5.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=powerpc 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 >>)" fs/pstore/ram_core.c:101:35: sparse: sparse: Variable length array is used. fs/pstore/ram_core.c:114:35: sparse: sparse: Variable length array is used. fs/pstore/ram_core.c:269:34: sparse: expected void volatile [noderef] <asn:2> *d fs/pstore/ram_core.c:269:34: sparse: got unsigned char * fs/pstore/ram_core.c:444:20: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected void *va @@ got void [noderef] <asn:2> * @@ fs/pstore/ram_core.c:444:20: sparse: expected void *va fs/pstore/ram_core.c:444:20: sparse: got void [noderef] <asn:2> * fs/pstore/ram_core.c:446:20: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected void *va @@ got void [noderef] <asn:2> * @@ fs/pstore/ram_core.c:446:20: sparse: expected void *va fs/pstore/ram_core.c:446:20: sparse: got void [noderef] <asn:2> * fs/pstore/ram_core.c:528:36: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void volatile [noderef] <asn:2> *addr @@ got void *vaddr @@ fs/pstore/ram_core.c:528:36: sparse: expected void volatile [noderef] <asn:2> *addr fs/pstore/ram_core.c:528:36: sparse: got void *vaddr fs/pstore/ram_core.c:68:17: sparse: sparse: context imbalance in 'buffer_start_add' - unexpected unlock fs/pstore/ram_core.c:94:17: sparse: sparse: context imbalance in 'buffer_size_add' - unexpected unlock In file included from arch/powerpc/include/asm/pgtable-ppc32.h:7:0, from arch/powerpc/include/asm/pgtable.h:19, from include/linux/mm.h:63, from include/linux/memblock.h:18, from fs/pstore/ram_core.c:24: include/linux/sched.h:1067:42: warning: type qualifiers ignored on function return type [-Wignored-qualifiers] const struct sched_group_energy * const(*sched_domain_energy_f)(int cpu); ^ In file included from include/linux/memblock.h:18:0, from fs/pstore/ram_core.c:24: include/linux/mm.h: In function 'is_vmalloc_addr': include/linux/mm.h:378:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return addr >= VMALLOC_START && addr < VMALLOC_END; ^ In file included from include/linux/ioport.h:12:0, from include/linux/device.h:16, from fs/pstore/ram_core.c:17: fs/pstore/ram_core.c: In function 'buffer_start_add': fs/pstore/ram_core.c:63:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (unlikely(new >= prz->buffer_size)) ^ include/linux/compiler.h:176:42: note: in definition of macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ fs/pstore/ram_core.c: In function 'persistent_ram_write': fs/pstore/ram_core.c:313:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (unlikely(c > prz->buffer_size)) { ^ include/linux/compiler.h:176:42: note: in definition of macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ fs/pstore/ram_core.c: In function 'persistent_ram_write_user': fs/pstore/ram_core.c:344:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (unlikely(c > prz->buffer_size)) { ^ include/linux/compiler.h:176:42: note: in definition of macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ fs/pstore/ram_core.c:365:29: warning: signed and unsigned type in conditional expression [-Wsign-compare] return unlikely(ret) ? ret : count; ^ vim +269 fs/pstore/ram_core.c 264 265 static void notrace persistent_ram_update(struct persistent_ram_zone *prz, 266 const void *s, unsigned int start, unsigned int count) 267 { 268 struct persistent_ram_buffer *buffer = prz->buffer; 270 persistent_ram_update_ecc(prz, start, count); 271 } 272 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org