We need a reliable stack unwinder for kernel live patching, but we do not want to enable frame pointers for performance reasons. So let ORC be a reliable stack unwinder on x86 as it performs nicely wrt reliability of traces.
Signed-off-by: Jiri Slaby <[email protected]> Cc: Josh Poimboeuf <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: [email protected] --- I am sending this as an RFC. Do you still consider ORC to be not-enough reliable? arch/x86/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 063f1e0d51aa..7403267407fc 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -172,7 +172,7 @@ config X86 select HAVE_PERF_USER_STACK_DUMP select HAVE_RCU_TABLE_FREE select HAVE_REGS_AND_STACK_ACCESS_API - select HAVE_RELIABLE_STACKTRACE if X86_64 && FRAME_POINTER_UNWINDER && STACK_VALIDATION + select HAVE_RELIABLE_STACKTRACE if X86_64 && (FRAME_POINTER_UNWINDER || ORC_UNWINDER) && STACK_VALIDATION select HAVE_STACK_VALIDATION if X86_64 select HAVE_SYSCALL_TRACEPOINTS select HAVE_UNSTABLE_SCHED_CLOCK -- 2.14.2
