Messages in this thread Patch in this message | | | Date | Wed, 9 Nov 2022 19:28:31 +0000 | Subject | [PATCH] arm64: ftrace: Define ftrace_stub_graph only with FUNCTION_GRAPH_TRACER | From | Sami Tolvanen <> |
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The 0-day bot reports that arm64 builds with CONFIG_CFI_CLANG + CONFIG_FTRACE are broken when CONFIG_FUNCTION_GRAPH_TRACER is not enabled:
ld.lld: error: undefined symbol: __kcfi_typeid_ftrace_stub_graph >>> referenced by entry-ftrace.S:299 (arch/arm64/kernel/entry-ftrace.S:299) >>> arch/arm64/kernel/entry-ftrace.o:(.text+0x48) in archive vmlinux.a
This is caused by ftrace_stub_graph using SYM_TYPE_FUNC_START when the address of the function is not taken in any C translation unit.
Fix the build by only defining ftrace_stub_graph when it's actually needed, i.e. with CONFIG_FUNCTION_GRAPH_TRACER.
Link: https://lore.kernel.org/lkml/202210251659.tRMs78RH-lkp@intel.com/ Fixes: 883bbbffa5a4 ("ftrace,kcfi: Separate ftrace_stub() and ftrace_stub_graph()") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Sami Tolvanen <samitolvanen@google.com> --- arch/arm64/kernel/entry-ftrace.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/entry-ftrace.S b/arch/arm64/kernel/entry-ftrace.S index 795344ab4ec4..322a831f8ede 100644 --- a/arch/arm64/kernel/entry-ftrace.S +++ b/arch/arm64/kernel/entry-ftrace.S @@ -299,11 +299,11 @@ SYM_TYPED_FUNC_START(ftrace_stub) ret SYM_FUNC_END(ftrace_stub) +#ifdef CONFIG_FUNCTION_GRAPH_TRACER SYM_TYPED_FUNC_START(ftrace_stub_graph) ret SYM_FUNC_END(ftrace_stub_graph) -#ifdef CONFIG_FUNCTION_GRAPH_TRACER /* * void return_to_handler(void) * base-commit: f141df371335645ce29a87d9683a3f79fba7fd67 -- 2.38.1.431.g37b22c650d-goog
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