tree: https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git ceph-fscache-iter head: 3e988e691f03e14d299a34cc55ee7f0e6a780a5d commit: d8c86ec1210d77793f0ed47e5fd996c497d8bcde [36/76] cachefiles: Implement extent shaper config: sh-allmodconfig (attached as .config) compiler: sh4-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout d8c86ec1210d77793f0ed47e5fd996c497d8bcde # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sh If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): In file included from include/linux/printk.h:7, from include/linux/kernel.h:15, from include/linux/list.h:9, from include/linux/mount.h:14, from fs/cachefiles/content-map.c:8: fs/cachefiles/content-map.c: In function 'cachefiles_expand_content_map': 5 | #define KERN_SOH "001" /* ASCII Start Of Header */ | ^~~~~~ include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH' 15 | #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */ | ^~~~~~~~ 272 | printk(KERN_DEBUG "[%-6.6s] "FMT"n", current->comm, ##__VA_ARGS__) | ^~~~~~~~~~ 274 | #define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__) | ^~~~~~~~~ 288 | kenter(FMT, ##__VA_ARGS__); | ^~~~~~ fs/cachefiles/content-map.c:260:2: note: in expansion of macro '_enter' 260 | _enter("%llx,%lx,%x", i_size, size, object->content_map_size); | ^~~~~~ fs/cachefiles/content-map.c:260:17: note: format string is defined here 260 | _enter("%llx,%lx,%x", i_size, size, object->content_map_size); | ~~^ | | | long unsigned int | %x vim +/KERN_DEBUG +272 fs/cachefiles/internal.h 9ae326a69004de David Howells 2009-04-03 266 9ae326a69004de David Howells 2009-04-03 267 9ae326a69004de David Howells 2009-04-03 268 /* 9ae326a69004de David Howells 2009-04-03 269 * debug tracing 9ae326a69004de David Howells 2009-04-03 270 */ 9ae326a69004de David Howells 2009-04-03 271 #define dbgprintk(FMT, ...) \ 9ae326a69004de David Howells 2009-04-03 @272 printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__) 9ae326a69004de David Howells 2009-04-03 273 9ae326a69004de David Howells 2009-04-03 @274 #define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__) 9ae326a69004de David Howells 2009-04-03 275 #define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__) 9ae326a69004de David Howells 2009-04-03 276 #define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__) 9ae326a69004de David Howells 2009-04-03 277 9ae326a69004de David Howells 2009-04-03 278 9ae326a69004de David Howells 2009-04-03 279 #if defined(__KDEBUG) 9ae326a69004de David Howells 2009-04-03 280 #define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__) 9ae326a69004de David Howells 2009-04-03 281 #define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__) 9ae326a69004de David Howells 2009-04-03 282 #define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__) 9ae326a69004de David Howells 2009-04-03 283 9ae326a69004de David Howells 2009-04-03 284 #elif defined(CONFIG_CACHEFILES_DEBUG) 9ae326a69004de David Howells 2009-04-03 285 #define _enter(FMT, ...) \ 9ae326a69004de David Howells 2009-04-03 286 do { \ 9ae326a69004de David Howells 2009-04-03 287 if (cachefiles_debug & CACHEFILES_DEBUG_KENTER) \ 9ae326a69004de David Howells 2009-04-03 @288 kenter(FMT, ##__VA_ARGS__); \ 9ae326a69004de David Howells 2009-04-03 289 } while (0) 9ae326a69004de David Howells 2009-04-03 290 :::::: The code at line 272 was first introduced by commit :::::: 9ae326a69004dea8af2dae4fde58de27db700a8d CacheFiles: A cache that backs onto a mounted filesystem :::::: 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