Hi Arnd, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: a74e6a014c9d4d4161061f770c9b4f98372ac778 commit: 45fe7befe0db5e61cd3c846315f0ac48541e8445 coresight: remove broken __exit annotations date: 3 months ago config: arm-randconfig-r013-20210311 (attached as .config) compiler: arm-linux-gnueabi-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 # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 45fe7befe0db5e61cd3c846315f0ac48541e8445 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): arch/arm/boot/compressed/atags_to_fdt.c:128:5: warning: no previous prototype for 'atags_to_fdt' [-Wmissing-prototypes] 128 | int atags_to_fdt(void *atag_list, void *fdt, int total_space) | ^~~~~~~~~~~~ arch/arm/boot/compressed/atags_to_fdt.c: In function 'merge_fdt_bootargs': 100 | } | ^ vim +100 arch/arm/boot/compressed/atags_to_fdt.c faefd550c45d8d Gregory CLEMENT 2013-05-15 70 d0f34a11ddab9b Genoud Richard 2012-06-26 71 static void merge_fdt_bootargs(void *fdt, const char *fdt_cmdline) d0f34a11ddab9b Genoud Richard 2012-06-26 72 { d0f34a11ddab9b Genoud Richard 2012-06-26 73 char cmdline[COMMAND_LINE_SIZE]; d0f34a11ddab9b Genoud Richard 2012-06-26 74 const char *fdt_bootargs; d0f34a11ddab9b Genoud Richard 2012-06-26 75 char *ptr = cmdline; d0f34a11ddab9b Genoud Richard 2012-06-26 76 int len = 0; d0f34a11ddab9b Genoud Richard 2012-06-26 77 d0f34a11ddab9b Genoud Richard 2012-06-26 78 /* copy the fdt command line into the buffer */ d0f34a11ddab9b Genoud Richard 2012-06-26 79 fdt_bootargs = getprop(fdt, "/chosen", "bootargs", &len); d0f34a11ddab9b Genoud Richard 2012-06-26 80 if (fdt_bootargs) d0f34a11ddab9b Genoud Richard 2012-06-26 81 if (len < COMMAND_LINE_SIZE) { d0f34a11ddab9b Genoud Richard 2012-06-26 82 memcpy(ptr, fdt_bootargs, len); d0f34a11ddab9b Genoud Richard 2012-06-26 83 /* len is the length of the string d0f34a11ddab9b Genoud Richard 2012-06-26 84 * including the NULL terminator */ d0f34a11ddab9b Genoud Richard 2012-06-26 85 ptr += len - 1; d0f34a11ddab9b Genoud Richard 2012-06-26 86 } d0f34a11ddab9b Genoud Richard 2012-06-26 87 d0f34a11ddab9b Genoud Richard 2012-06-26 88 /* and append the ATAG_CMDLINE */ d0f34a11ddab9b Genoud Richard 2012-06-26 89 if (fdt_cmdline) { d0f34a11ddab9b Genoud Richard 2012-06-26 90 len = strlen(fdt_cmdline); d0f34a11ddab9b Genoud Richard 2012-06-26 91 if (ptr - cmdline + len + 2 < COMMAND_LINE_SIZE) { d0f34a11ddab9b Genoud Richard 2012-06-26 92 *ptr++ = ' '; d0f34a11ddab9b Genoud Richard 2012-06-26 93 memcpy(ptr, fdt_cmdline, len); d0f34a11ddab9b Genoud Richard 2012-06-26 94 ptr += len; d0f34a11ddab9b Genoud Richard 2012-06-26 95 } d0f34a11ddab9b Genoud Richard 2012-06-26 96 } d0f34a11ddab9b Genoud Richard 2012-06-26 97 *ptr = '\0'; d0f34a11ddab9b Genoud Richard 2012-06-26 98 d0f34a11ddab9b Genoud Richard 2012-06-26 99 setprop_string(fdt, "/chosen", "bootargs", cmdline); d0f34a11ddab9b Genoud Richard 2012-06-26 @100 } d0f34a11ddab9b Genoud Richard 2012-06-26 101 :::::: The code at line 100 was first introduced by commit :::::: d0f34a11ddab9b456e4caf9fc48d8d7e832e0e50 ARM: 7437/1: zImage: Allow DTB command line concatenation with ATAG_CMDLINE :::::: TO: Genoud Richard <richard.genoud(a)gmail.com&gt; :::::: CC: Russell King <rmk+kernel(a)arm.linux.org.uk&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org