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-mpc836x_rdk_defconfig (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 error/warnings (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': 173 | BUILD_BUG_ON_MSG(1, "Unsupported size for __xchg"); | ^~~~~~~~~~~~~~~~ In file included 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': 87 | __WARN(); \ | ^~~~~~ 54 | WARN_ON((unsigned long)addr & (L1_CACHE_BYTES - 1)); | ^~~~~~~ 90 | BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \ | ^~~~~~~~~~ arch/powerpc/include/asm/bug.h:57:10: note: in definition of macro 'BUG_ENTRY' 57 | "i" (flags), \ | ^~~~~ 90 | BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \ | ^~~~~~~~~~~~~ 54 | WARN_ON((unsigned long)addr & (L1_CACHE_BYTES - 1)); | ^~~~~~~ arch/powerpc/include/asm/bug.h:90:38: note: each undeclared identifier is reported only once for each function it appears in 90 | BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \ | ^~~~~~~~~~ arch/powerpc/include/asm/bug.h:57:10: note: in definition of macro 'BUG_ENTRY' 57 | "i" (flags), \ | ^~~~~ 90 | BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \ | ^~~~~~~~~~~~~ 54 | WARN_ON((unsigned long)addr & (L1_CACHE_BYTES - 1)); | ^~~~~~~ 58 | "i" (sizeof(struct bug_entry)), \ | ^~~~~~ 89 | BUG_ENTRY(PPC_TLNEI " %4, 0", \ | ^~~~~~~~~ 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': 134 | WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count); | ^~~~ include/linux/thread_info.h: In function 'check_copy_size': 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 38 real 7 user 12 sys 51.95% cpu make prepare vim +/BUILD_BUG_ON_MSG +173 arch/powerpc/include/asm/cmpxchg.h ae3a197e3d0bfe David Howells 2012-03-28 157 ae3a197e3d0bfe David Howells 2012-03-28 158 static __always_inline unsigned long d0563a1297e234 Pan Xinhui 2016-04-27 159 __xchg_local(void *ptr, unsigned long x, unsigned int size) ae3a197e3d0bfe David Howells 2012-03-28 160 { ae3a197e3d0bfe David Howells 2012-03-28 161 switch (size) { d0563a1297e234 Pan Xinhui 2016-04-27 162 case 1: d0563a1297e234 Pan Xinhui 2016-04-27 163 return __xchg_u8_local(ptr, x); d0563a1297e234 Pan Xinhui 2016-04-27 164 case 2: d0563a1297e234 Pan Xinhui 2016-04-27 165 return __xchg_u16_local(ptr, x); ae3a197e3d0bfe David Howells 2012-03-28 166 case 4: 26760fc19a7e66 Boqun Feng 2015-12-15 167 return __xchg_u32_local(ptr, x); ae3a197e3d0bfe David Howells 2012-03-28 168 #ifdef CONFIG_PPC64 ae3a197e3d0bfe David Howells 2012-03-28 169 case 8: 26760fc19a7e66 Boqun Feng 2015-12-15 170 return __xchg_u64_local(ptr, x); ae3a197e3d0bfe David Howells 2012-03-28 171 #endif ae3a197e3d0bfe David Howells 2012-03-28 172 } 10d8b1480e6966 pan xinhui 2016-02-23 @173 BUILD_BUG_ON_MSG(1, "Unsupported size for __xchg"); ae3a197e3d0bfe David Howells 2012-03-28 174 return x; ae3a197e3d0bfe David Howells 2012-03-28 175 } ae3a197e3d0bfe David Howells 2012-03-28 176 :::::: The code at line 173 was first introduced by commit :::::: 10d8b1480e6966ba03cd3afad3b5d6eb5e341fae powerpc: Use BUILD_BUG_ON_MSG() for unsupported {cmp}xchg sizes :::::: TO: pan xinhui <xinhui.pan(a)linux.vnet.ibm.com&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