[PATCH] x86: select ARCH_WANT_FRAME_POINTERS again when UNWINDER_FRAME_POINTER=y

[Masahiro Yamada]

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 commit 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.

Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
---

 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 c5d614d28a75..74777a97e394 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
-- 
2.40.1