tree: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git fscache-iter head: b4a9eadc021941103fd0c925e7e7b38516ffaf39 commit: 5db57596b0d3e5e78f7202dd50a58cc154f66b7c [22/62] fscache: Replace the object management state machine :::::: branch date: 6 days ago :::::: commit date: 6 days ago config: x86_64-randconfig-s022-20200602 (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.1-243-gc100a7ab-dirty git checkout 5db57596b0d3e5e78f7202dd50a58cc154f66b7c # save the attached .config to linux build tree make W=1 C=1 ARCH=x86_64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) # https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/com... git remote add dhowells-fs https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git git remote update dhowells-fs git checkout 5db57596b0d3e5e78f7202dd50a58cc154f66b7c vim +80 include/linux/fscache.h 2d6fff63703739 David Howells 2009-04-03 68 5db57596b0d3e5 David Howells 2020-02-06 69 /* 5db57596b0d3e5 David Howells 2020-02-06 70 * Data object state. 5db57596b0d3e5 David Howells 2020-02-06 71 */ 5db57596b0d3e5 David Howells 2020-02-06 72 enum fscache_cookie_stage { 5db57596b0d3e5 David Howells 2020-02-06 73 FSCACHE_COOKIE_STAGE_QUIESCENT, /* The cookie is uncached */ 5db57596b0d3e5 David Howells 2020-02-06 74 FSCACHE_COOKIE_STAGE_INITIALISING, /* The in-memory structs are being inited */ 5db57596b0d3e5 David Howells 2020-02-06 75 FSCACHE_COOKIE_STAGE_LOOKING_UP, /* The cache object is being looked up */ 5db57596b0d3e5 David Howells 2020-02-06 76 FSCACHE_COOKIE_STAGE_NO_DATA_YET, /* The cache has no data, read to network */ 5db57596b0d3e5 David Howells 2020-02-06 77 FSCACHE_COOKIE_STAGE_ACTIVE, /* The cache is active, readable and writable */ 5db57596b0d3e5 David Howells 2020-02-06 78 FSCACHE_COOKIE_STAGE_INVALIDATING, /* The cache is being invalidated */ 5db57596b0d3e5 David Howells 2020-02-06 79 FSCACHE_COOKIE_STAGE_DEAD, /* The cache object is dead */ 5db57596b0d3e5 David Howells 2020-02-06 @80 } __attribute__((mode(byte))); 5db57596b0d3e5 David Howells 2020-02-06 81 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org