With CONFIG_CFI_CLANG, the compiler replaces function pointers with jump table addresses, which breaks dynamic ftrace as the address of ftrace_call is replaced with the address of ftrace_call.cfi_jt. Use function_nocfi() to get the address of the actual function instead. Suggested-by: Ben Dai <ben.dai@xxxxxxxxxx> Signed-off-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx> Acked-by: Mark Rutland <mark.rutland@xxxxxxx> Tested-by: Nathan Chancellor <nathan@xxxxxxxxxx> --- arch/arm64/kernel/ftrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kernel/ftrace.c b/arch/arm64/kernel/ftrace.c index 86a5cf9bc19a..b5d3ddaf69d9 100644 --- a/arch/arm64/kernel/ftrace.c +++ b/arch/arm64/kernel/ftrace.c @@ -55,7 +55,7 @@ int ftrace_update_ftrace_func(ftrace_func_t func) unsigned long pc; u32 new; - pc = (unsigned long)&ftrace_call; + pc = (unsigned long)function_nocfi(ftrace_call); new = aarch64_insn_gen_branch_imm(pc, (unsigned long)func, AARCH64_INSN_BRANCH_LINK); -- 2.31.1.295.g9ea45b61b8-goog
