linux-kernel - [RFC PATCH 4/4] x86/Kconfig: Add a Kconfig option to sort ORC tables at build time

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Date:   Thu,  7 Nov 2019 22:32:05 +0800
From:   shile.zhang@...ux.alibaba.com
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org
Cc:     "H . Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org,
        Shile Zhang <shile.zhang@...ux.alibaba.com>
Subject: [RFC PATCH 4/4] x86/Kconfig: Add a Kconfig option to sort ORC tables at build time

From: Shile Zhang <shile.zhang@...ux.alibaba.com>

Add a new Kconfig BUILDTIME_ORCTABLE_SORT to control the ORC unwind
tables at build time. Select for ORC unwinder on x86_64 by default.

Signed-off-by: Shile Zhang <shile.zhang@...ux.alibaba.com>
---
 arch/x86/Kconfig.debug | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index bf9cd83de777..320ff2af4837 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -335,6 +335,15 @@ config UNWINDER_GUESS
 
 endchoice
 
+config BUILDTIME_ORCTABLE_SORT
+	bool "Sort ORC unwind tables at build time"
+	depends on X86_64
+	depends on UNWINDER_ORC
+	default y
+	help
+	This option enables the build-time sorting for ORC unwind tables. It
+	can help to speed up kernel boot by skip the runtime sorting.
+
 config FRAME_POINTER
 	depends on !UNWINDER_ORC && !UNWINDER_GUESS
 	bool
-- 
2.24.0.rc2