[PATCH v12 09/13] unwind_user/sframe/x86: Enable sframe unwinding on x86

[Jens Remus]

From: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>

The x86 SFrame V2 implementation works fairly well, starting with
binutils 2.45 with PC-relative SFrame FDE function start address
encoding (though some issues are getting fixed in later versions).
Enable it.

[ Jens Remus: Reword commit message for SFrame V2 PC-relative FDE
function start address encoding, starting with binutils 2.45. ]

Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Andrii Nakryiko <andrii@xxxxxxxxxx>
Cc: Indu Bhagat <indu.bhagat@xxxxxxxxxx>
Cc: "Jose E. Marchesi" <jemarch@xxxxxxx>
Cc: Beau Belgrave <beaub@xxxxxxxxxxxxxxxxxxx>
Cc: Jens Remus <jremus@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Florian Weimer <fweimer@xxxxxxxxxx>
Cc: Sam James <sam@xxxxxxxxxx>
Cc: Kees Cook <kees@xxxxxxxxxx>
Cc: "Carlos O'Donell" <codonell@xxxxxxxxxx>
Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Jens Remus <jremus@xxxxxxxxxxxxx>
---

Notes (jremus):
    Changes in v12:
    - Reword commit message for SFrame V2 PC-relative FDE function start
      address encoding, starting with binutils 2.45.

 arch/x86/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c4c21e8d0772..0e9a9c5ca0bc 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -299,6 +299,7 @@ config X86
 	select HAVE_UACCESS_VALIDATION		if HAVE_OBJTOOL
 	select HAVE_UNSTABLE_SCHED_CLOCK
 	select HAVE_UNWIND_USER_FP		if X86_64
+	select HAVE_UNWIND_USER_SFRAME		if X86_64
 	select HAVE_USER_RETURN_NOTIFIER
 	select HAVE_GENERIC_VDSO
 	select VDSO_GETRANDOM			if X86_64
-- 
2.48.1