linux-kernel - [PATCH RFC 10/10] unwind/x86/64: Add HAVE_USER_UNWIND

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Date:   Wed,  8 Nov 2023 16:41:15 -0800
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Indu Bhagat <indu.bhagat@...cle.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        linux-toolchains@...r.kernel.org
Subject: [PATCH RFC 10/10] unwind/x86/64: Add HAVE_USER_UNWIND_SFRAME

Binutils 2.40 supports generating sframe for x86_64.  It works well in
testing so enable it.

NOTE: An out-of-tree glibc patch is still needed to enable setting
PR_ADD_SFRAME for shared libraries and dlopens.

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 arch/x86/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 95939cd54dfe..770d0528e4c9 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -279,6 +279,7 @@ config X86
 	select HAVE_UNSTABLE_SCHED_CLOCK
 	select HAVE_USER_RETURN_NOTIFIER
 	select HAVE_USER_UNWIND
+	select HAVE_USER_UNWIND_SFRAME		if X86_64
 	select HAVE_GENERIC_VDSO
 	select HOTPLUG_PARALLEL			if SMP && X86_64
 	select HOTPLUG_SMT			if SMP
-- 
2.41.0