On Fri, Dec 18, 2020 at 05:00:16AM +0800, kernel test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > master > head: 74f602dc96dd854c7b2034947798c1e2a6b84066 > commit: 68c5debcc06d6d24f15dbf978780fc5efc147d5e arm64: implement CPPC FFH > support using AMUs > date: 5 weeks ago > config: arm64-randconfig-s032-20201217 (attached as .config) > compiler: aarch64-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: v0.6.3-184-g1b896707-dirty > # > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=68c5debcc06d6d24f15dbf978780fc5efc147d5e > git remote add linus > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > git fetch --no-tags linus master > git checkout 68c5debcc06d6d24f15dbf978780fc5efc147d5e > # 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=arm64 > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <l...@intel.com> > > > "sparse warnings: (new ones prefixed by >>)" > >> arch/arm64/kernel/topology.c:367:22: sparse: sparse: dereference of > >> noderef expression > > vim +367 arch/arm64/kernel/topology.c > > 362 > 363 int cpc_read_ffh(int cpu, struct cpc_reg *reg, u64 *val) > 364 { > 365 int ret = -EOPNOTSUPP; > 366 > > 367 switch ((u64)reg->address) {
That's not a dereference but I guess sparse complains of dropping the __iomem. We could change the cast to (__force u64) to silence sparse. Thanks for the report. -- Catalin
