Messages in this thread | | | Date | Sun, 4 Jul 2021 12:04:05 +0800 | From | kernel test robot <> | Subject | [joro:sev-es-kexec 1/12] kernel/kexec.c:198:13: warning: no previous prototype for function 'arch_kexec_supported' |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git sev-es-kexec head: 3467dc3cdbe65c619cd9b5c8db47da63b0655300 commit: 4eeabbfae0a6163e935a6462acc02fe4f17d3680 [1/12] kexec: Allow architecture code to opt-out at runtime config: powerpc-randconfig-r005-20210702 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9eb613b2de3163686b1a4bd1160f15ac56a4b083) 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 # install powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git/commit/?id=4eeabbfae0a6163e935a6462acc02fe4f17d3680 git remote add joro https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git git fetch --no-tags joro sev-es-kexec git checkout 4eeabbfae0a6163e935a6462acc02fe4f17d3680 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
In file included from kernel/kexec.c:10: In file included from include/linux/mm.h:9: In file included from include/linux/mmdebug.h:5: In file included from include/linux/bug.h:5: In file included from arch/powerpc/include/asm/bug.h:109: In file included from include/asm-generic/bug.h:20: In file included from include/linux/kernel.h:12: In file included from include/linux/bitops.h:32: In file included from arch/powerpc/include/asm/bitops.h:62: arch/powerpc/include/asm/barrier.h:49:9: warning: '__lwsync' macro redefined [-Wmacro-redefined] #define __lwsync() __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory") ^ <built-in>:308:9: note: previous definition is here #define __lwsync __builtin_ppc_lwsync ^ >> kernel/kexec.c:198:13: warning: no previous prototype for function 'arch_kexec_supported' [-Wmissing-prototypes] bool __weak arch_kexec_supported(void) ^ kernel/kexec.c:198:1: note: declare 'static' if the function is not intended to be used outside of this translation unit bool __weak arch_kexec_supported(void) ^ static 2 warnings generated.
vim +/arch_kexec_supported +198 kernel/kexec.c
176 177 /* 178 * Exec Kernel system call: for obvious reasons only root may call it. 179 * 180 * This call breaks up into three pieces. 181 * - A generic part which loads the new kernel from the current 182 * address space, and very carefully places the data in the 183 * allocated pages. 184 * 185 * - A generic part that interacts with the kernel and tells all of 186 * the devices to shut down. Preventing on-going dmas, and placing 187 * the devices in a consistent state so a later kernel can 188 * reinitialize them. 189 * 190 * - A machine specific part that includes the syscall number 191 * and then copies the image to it's final destination. And 192 * jumps into the image at entry. 193 * 194 * kexec does not sync, or unmount filesystems so if you need 195 * that to happen you need to do that yourself. 196 */ 197 > 198 bool __weak arch_kexec_supported(void) 199 { 200 return true; 201 } 202
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