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SubjectRe: arch/powerpc/kernel/stacktrace.c:171:9: error: implicit declaration of function 'nmi_cpu_backtrace'
On Fri, Jan 14, 2022 at 06:13:37AM +0800, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: fb3b0673b7d5b477ed104949450cd511337ba3c6
> commit: 1614b2b11fab29dd4ff31ebba9d266961f5af69e arch: Make ARCH_STACKWALK independent of STACKTRACE
> date: 5 weeks ago
> config: powerpc64-randconfig-r025-20220113 (https://download.01.org/0day-ci/archive/20220114/202201140631.ZuSwa9QF-lkp@intel.com/config)
> compiler: powerpc64-linux-gcc (GCC) 11.2.0
> 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/?id=1614b2b11fab29dd4ff31ebba9d266961f5af69e
> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> git fetch --no-tags linus master
> git checkout 1614b2b11fab29dd4ff31ebba9d266961f5af69e
> # save the config file to linux build tree
> mkdir build_dir
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=powerpc SHELL=/bin/bash
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
>
> All errors (new ones prefixed by >>):
>
> arch/powerpc/kernel/stacktrace.c: In function 'handle_backtrace_ipi':
> >> arch/powerpc/kernel/stacktrace.c:171:9: error: implicit declaration of function 'nmi_cpu_backtrace' [-Werror=implicit-function-declaration]
> 171 | nmi_cpu_backtrace(regs);
> | ^~~~~~~~~~~~~~~~~
> arch/powerpc/kernel/stacktrace.c: At top level:
> arch/powerpc/kernel/stacktrace.c:224:6: warning: no previous prototype for 'arch_trigger_cpumask_backtrace' [-Wmissing-prototypes]
> 224 | void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/powerpc/kernel/stacktrace.c: In function 'arch_trigger_cpumask_backtrace':
> >> arch/powerpc/kernel/stacktrace.c:226:9: error: implicit declaration of function 'nmi_trigger_cpumask_backtrace'; did you mean 'arch_trigger_cpumask_backtrace'? [-Werror=implicit-function-declaration]
> 226 | nmi_trigger_cpumask_backtrace(mask, exclude_self, raise_backtrace_ipi);
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> | arch_trigger_cpumask_backtrace
> cc1: some warnings being treated as errors

I suppose this ought to cure things...

diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktrace.c
index a2443d61728e..bde1aaedeb72 100644
--- a/arch/powerpc/kernel/stacktrace.c
+++ b/arch/powerpc/kernel/stacktrace.c
@@ -165,7 +165,7 @@ int __no_sanitize_address arch_stack_walk_reliable(stack_trace_consume_fn consum
return 0;
}

-#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_NMI_IPI)
+#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_NMI_IPI) && defined(CONFIG_STACKTRACE)
static void handle_backtrace_ipi(struct pt_regs *regs)
{
nmi_cpu_backtrace(regs);
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