linux-kernel - [tip: x86/urgent] x86/kconfig: Select ARCH_WANT_FRAME_POINTERS again when UNWINDER_FRAME

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Date: Mon, 20 May 2024 09:52:08 -0000
From: "tip-bot2 for Masahiro Yamada" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Masahiro Yamada <masahiroy@...nel.org>,
 "Borislav Petkov (AMD)" <bp@...en8.de>, Josh Poimboeuf <jpoimboe@...nel.org>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/urgent] x86/kconfig: Select ARCH_WANT_FRAME_POINTERS again
 when UNWINDER_FRAME_POINTER=y

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     66ee3636eddcc82ab82b539d08b85fb5ac1dff9b
Gitweb:        https://git.kernel.org/tip/66ee3636eddcc82ab82b539d08b85fb5ac1dff9b
Author:        Masahiro Yamada <masahiroy@...nel.org>
AuthorDate:    Sun, 04 Feb 2024 21:20:03 +09:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Mon, 20 May 2024 11:37:23 +02:00

x86/kconfig: Select ARCH_WANT_FRAME_POINTERS again when UNWINDER_FRAME_POINTER=y

It took me some time to understand the purpose of the tricky code at
the end of arch/x86/Kconfig.debug.

Without it, the following would be shown:

  WARNING: unmet direct dependencies detected for FRAME_POINTER

because

  81d387190039 ("x86/kconfig: Consolidate unwinders into multiple choice selection")

removed 'select ARCH_WANT_FRAME_POINTERS'.

The correct and more straightforward approach should have been to move
it where 'select FRAME_POINTER' is located.

Several architectures properly handle the conditional selection of
ARCH_WANT_FRAME_POINTERS. For example, 'config UNWINDER_FRAME_POINTER'
in arch/arm/Kconfig.debug.

Fixes: 81d387190039 ("x86/kconfig: Consolidate unwinders into multiple choice selection")
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Acked-by: Josh Poimboeuf <jpoimboe@...nel.org>
Link: https://lore.kernel.org/r/20240204122003.53795-1-masahiroy@kernel.org
---
 arch/x86/Kconfig.debug | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index c5d614d..74777a9 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -248,6 +248,7 @@ config UNWINDER_ORC
 
 config UNWINDER_FRAME_POINTER
 	bool "Frame pointer unwinder"
+	select ARCH_WANT_FRAME_POINTERS
 	select FRAME_POINTER
 	help
 	  This option enables the frame pointer unwinder for unwinding kernel
@@ -271,7 +272,3 @@ config UNWINDER_GUESS
 	  overhead.
 
 endchoice
-
-config FRAME_POINTER
-	depends on !UNWINDER_ORC && !UNWINDER_GUESS
-	bool