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Subject[joro:sev-es-kexec 2/12] arch/x86/kernel/machine_kexec_64.c:627:6: warning: no previous prototype for 'arch_kexec_supported'
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git sev-es-kexec
head: 3467dc3cdbe65c619cd9b5c8db47da63b0655300
commit: 441bc34569808f9c19fcbe8c1b7625402b9b9786 [2/12] x86/kexec/64: Forbid kexec when running as an SEV-ES guest
config: x86_64-randconfig-c022-20210702 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
# https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git/commit/?id=441bc34569808f9c19fcbe8c1b7625402b9b9786
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 441bc34569808f9c19fcbe8c1b7625402b9b9786
# save the attached .config to linux build tree
make W=1 ARCH=x86_64

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 >>):

>> arch/x86/kernel/machine_kexec_64.c:627:6: warning: no previous prototype for 'arch_kexec_supported' [-Wmissing-prototypes]
627 | bool arch_kexec_supported(void)
| ^~~~~~~~~~~~~~~~~~~~


vim +/arch_kexec_supported +627 arch/x86/kernel/machine_kexec_64.c

623
624 /*
625 * Kexec is not supported in SEV-ES guests yet
626 */
> 627 bool arch_kexec_supported(void)

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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