4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Masahiro Yamada <masahiroy@xxxxxxxxxx>
[ Upstream commit 66ee3636eddcc82ab82b539d08b85fb5ac1dff9b ]
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@xxxxxxxxxx>
Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Acked-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240204122003.53795-1-masahiroy@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@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 687cd1a213d50..82170d6257b1c 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -376,6 +376,7 @@ 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
@@ -403,7 +404,3 @@ config UNWINDER_GUESS
overhead.
endchoice
-
-config FRAME_POINTER
- depends on !UNWINDER_ORC && !UNWINDER_GUESS
- bool
--
2.43.0
