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x86/kconfig: Select ARCH_WANT_FRAME_POINTERS again when UNWINDER_FRAME_POINTER=y

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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

  81d3871900 ("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: 81d3871900 ("x86/kconfig: Consolidate unwinders into multiple choice selection")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/r/20240204122003.53795-1-masahiroy@kernel.org
This commit is contained in:
Masahiro Yamada 2024-02-04 21:20:03 +09:00 committed by Borislav Petkov (AMD)
parent 9dba9c67e5
commit 66ee3636ed
1 changed files with 1 additions and 4 deletions
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5
arch/x86/Kconfig.debug
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@ -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