Hi Eugeniu, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on linux/master] [also build test ERROR on pmladek/for-next linus/master v5.6-rc6 next-20200316] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Eugeniu-Rosca/Fix-quiet-console-... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git f5ae2ea6347a308cfe91f53b53682ce635497d0d config: powerpc-allnoconfig (attached as .config) compiler: powerpc-linux-gcc (GCC) 9.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=9.2.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from arch/powerpc/include/asm/atomic.h:11, from include/linux/atomic.h:7, from include/linux/printk.h:6, from include/linux/kernel.h:15, from include/asm-generic/bug.h:19, from arch/powerpc/include/asm/bug.h:109, from include/linux/bug.h:5, from include/linux/page-flags.h:10, from kernel/bounds.c:10: arch/powerpc/include/asm/cmpxchg.h: In function '__xchg_local': arch/powerpc/include/asm/cmpxchg.h:173:2: error: implicit declaration of function 'BUILD_BUG_ON_MSG' [-Werror=implicit-function-declaration] 173 | BUILD_BUG_ON_MSG(1, "Unsupported size for __xchg"); | ^~~~~~~~~~~~~~~~ In file included from arch/powerpc/include/asm/page.h:254, from arch/powerpc/include/asm/thread_info.h:23, from include/linux/thread_info.h:38, from arch/powerpc/include/asm/ptrace.h:218, from arch/powerpc/include/asm/hw_irq.h:12, from arch/powerpc/include/asm/irqflags.h:12, from include/linux/irqflags.h:16, from include/asm-generic/cmpxchg-local.h:6, from arch/powerpc/include/asm/cmpxchg.h:537, from arch/powerpc/include/asm/atomic.h:11, from include/linux/atomic.h:7, from include/linux/printk.h:6, from include/linux/kernel.h:15, from include/asm-generic/bug.h:19, from arch/powerpc/include/asm/bug.h:109, from include/linux/bug.h:5, from include/linux/page-flags.h:10, from kernel/bounds.c:10: arch/powerpc/include/asm/page_32.h: In function 'clear_page': 54 | WARN_ON((unsigned long)addr & (L1_CACHE_BYTES - 1)); | ^~~~~~~ In file included from arch/powerpc/include/asm/ptrace.h:218, from arch/powerpc/include/asm/hw_irq.h:12, from arch/powerpc/include/asm/irqflags.h:12, from include/linux/irqflags.h:16, from include/asm-generic/cmpxchg-local.h:6, from arch/powerpc/include/asm/cmpxchg.h:537, from arch/powerpc/include/asm/atomic.h:11, from include/linux/atomic.h:7, from include/linux/printk.h:6, from include/linux/kernel.h:15, from include/asm-generic/bug.h:19, from arch/powerpc/include/asm/bug.h:109, from include/linux/bug.h:5, from include/linux/page-flags.h:10, from kernel/bounds.c:10: include/linux/thread_info.h: In function 'copy_overflow': include/linux/thread_info.h:134:2: error: implicit declaration of function 'WARN' [-Werror=implicit-function-declaration] 134 | WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count); | ^~~~ include/linux/thread_info.h: In function 'check_copy_size': include/linux/thread_info.h:150:6: error: implicit declaration of function 'WARN_ON_ONCE' [-Werror=implicit-function-declaration] 150 | if (WARN_ON_ONCE(bytes > INT_MAX)) | ^~~~~~~~~~~~ cc1: some warnings being treated as errors make[2]: *** [scripts/Makefile.build:99: kernel/bounds.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1113: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:179: sub-make] Error 2 16 real 4 user 6 sys 68.27% cpu make prepare vim +/WARN_ON +54 arch/powerpc/include/asm/page_32.h 7ab0b7cb8951d4 arch/powerpc/include/asm/page_32.h Christophe Leroy 2019-08-16 44 5736f96d12dd42 arch/powerpc/include/asm/page_32.h Christophe Leroy 2016-02-09 45 /* 5736f96d12dd42 arch/powerpc/include/asm/page_32.h Christophe Leroy 2016-02-09 46 * Clear page using the dcbz instruction, which doesn't cause any 5736f96d12dd42 arch/powerpc/include/asm/page_32.h Christophe Leroy 2016-02-09 47 * memory traffic (except to write out any cache lines which get 5736f96d12dd42 arch/powerpc/include/asm/page_32.h Christophe Leroy 2016-02-09 48 * displaced). This only works on cacheable memory. 5736f96d12dd42 arch/powerpc/include/asm/page_32.h Christophe Leroy 2016-02-09 49 */ 5736f96d12dd42 arch/powerpc/include/asm/page_32.h Christophe Leroy 2016-02-09 50 static inline void clear_page(void *addr) 5736f96d12dd42 arch/powerpc/include/asm/page_32.h Christophe Leroy 2016-02-09 51 { 5736f96d12dd42 arch/powerpc/include/asm/page_32.h Christophe Leroy 2016-02-09 52 unsigned int i; 5736f96d12dd42 arch/powerpc/include/asm/page_32.h Christophe Leroy 2016-02-09 53 7ab0b7cb8951d4 arch/powerpc/include/asm/page_32.h Christophe Leroy 2019-08-16 @54 WARN_ON((unsigned long)addr & (L1_CACHE_BYTES - 1)); 7ab0b7cb8951d4 arch/powerpc/include/asm/page_32.h Christophe Leroy 2019-08-16 55 5736f96d12dd42 arch/powerpc/include/asm/page_32.h Christophe Leroy 2016-02-09 56 for (i = 0; i < PAGE_SIZE / L1_CACHE_BYTES; i++, addr += L1_CACHE_BYTES) 5736f96d12dd42 arch/powerpc/include/asm/page_32.h Christophe Leroy 2016-02-09 57 dcbz(addr); 5736f96d12dd42 arch/powerpc/include/asm/page_32.h Christophe Leroy 2016-02-09 58 } 5cd16ee934eafc include/asm-powerpc/page_32.h Michael Ellerman 2005-11-11 59 extern void copy_page(void *to, void *from); 5cd16ee934eafc include/asm-powerpc/page_32.h Michael Ellerman 2005-11-11 60 :::::: The code at line 54 was first introduced by commit :::::: 7ab0b7cb8951d4095d73e203759b74d41916e455 powerpc/32: Add warning on misaligned copy_page() or clear_page() :::::: TO: Christophe Leroy <christophe.leroy(a)c-s.fr&gt; :::::: CC: Michael Ellerman <mpe(a)ellerman.id.au&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org