From: Jiri Slaby <jslaby@suse.cz>

Date: Wed, 4 Oct 2017 11:14:26 +0200

Subject: x86/stacktrace: orc, mark it as reliable

Patch-mainline: submitted on 2017/12/5

References: bnc#1058115

In SUSE, we need a reliable stack unwinder for kernel live patching, but

we do not want to enable frame pointers for performance reasons. So

after the previous patches to make the ORC reliable, mark ORC as a

reliable stack unwinder on x86.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>

Cc: Josh Poimboeuf <jpoimboe@redhat.com>

Cc: Thomas Gleixner <tglx@linutronix.de>

Cc: Ingo Molnar <mingo@redhat.com>

Cc: "H. Peter Anvin" <hpa@zytor.com>

Cc: x86@kernel.org

---

 arch/x86/Kconfig |    2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/Kconfig

+++ b/arch/x86/Kconfig

@@ -161,7 +161,7 @@ config X86

 	select HAVE_PERF_REGS

 	select HAVE_PERF_USER_STACK_DUMP

 	select HAVE_REGS_AND_STACK_ACCESS_API

-	select HAVE_RELIABLE_STACKTRACE		if X86_64 && UNWINDER_FRAME_POINTER && STACK_VALIDATION

+	select HAVE_RELIABLE_STACKTRACE		if X86_64 && (UNWINDER_FRAME_POINTER || UNWINDER_ORC) && STACK_VALIDATION

 	select HAVE_STACK_VALIDATION		if X86_64

 	select HAVE_SYSCALL_TRACEPOINTS

 	select HAVE_UNSTABLE_SCHED_CLOCK