tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git debugfs_remove_return_value head: a9982873fa1b922bd9001be2720dc624970f47d8 commit: b5ecb947d7ee5c3510544593d3932cd6f6515afc [19/20] debugfs: remove return value of debugfs_create_u32() config: powerpc-randconfig-a001-20200308 (attached as .config) compiler: powerpc64-linux-gcc (GCC) 7.5.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout b5ecb947d7ee5c3510544593d3932cd6f6515afc # save the attached .config to linux build tree GCC_VERSION=7.5.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): arch/powerpc/kernel/traps.c: In function 'ppc_warn_emulated_init': >> arch/powerpc/kernel/traps.c:2293:4: error: void value not ignored as it ought to be d = debugfs_create_u32("do_warn", 0644, dir, ^ arch/powerpc/kernel/traps.c:2299:5: error: void value not ignored as it ought to be d = debugfs_create_u32(entries[i].name, 0644, dir, ^ vim +2293 arch/powerpc/kernel/traps.c 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2278 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2279 static int __init ppc_warn_emulated_init(void) 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2280 { 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2281 struct dentry *dir, *d; 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2282 unsigned int i; 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2283 struct ppc_emulated_entry *entries = (void *)&ppc_emulated; 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2284 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2285 if (!powerpc_debugfs_root) 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2286 return -ENODEV; 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2287 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2288 dir = debugfs_create_dir("emulated_instructions", 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2289 powerpc_debugfs_root); 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2290 if (!dir) 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2291 return -ENOMEM; 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2292 57ad583f2086d5 Russell Currey 2017-01-12 @2293 d = debugfs_create_u32("do_warn", 0644, dir, 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2294 &ppc_warn_emulated); 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2295 if (!d) 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2296 goto fail; 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2297 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2298 for (i = 0; i < sizeof(ppc_emulated)/sizeof(*entries); i++) { 57ad583f2086d5 Russell Currey 2017-01-12 2299 d = debugfs_create_u32(entries[i].name, 0644, dir, 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2300 (u32 *)&entries[i].val.counter); 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2301 if (!d) 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2302 goto fail; 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2303 } 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2304 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2305 return 0; 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2306 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2307 fail: 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2308 debugfs_remove_recursive(dir); 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2309 return -ENOMEM; 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2310 } 80947e7c99c29c Geert Uytterhoeven 2009-05-18 2311 :::::: The code at line 2293 was first introduced by commit :::::: 57ad583f2086d55ada284c54bfc440123cf73964 powerpc: Use octal numbers for file permissions :::::: TO: Russell Currey <ruscur@xxxxxxxxxx> :::::: CC: Michael Ellerman <mpe@xxxxxxxxxxxxxx> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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