[PATCH v3 2/2] kconfig: Remove the architecture specific config for Propeller

[xur@google.com]

From: Rong Xu <xur@google.com>

The CONFIG_PROPELLER_CLANG option currently depends on
ARCH_SUPPORTS_PROPELLER_CLANG, but this dependency seems unnecessary.

Remove ARCH_SUPPORTS_PROPELLER_CLANG and allow users to control
Propeller builds solely through CONFIG_PROPELLER_CLANG. This simplifies
the kconfig and avoids potential confusion.

For arm64, change vmlinux.lds.S to ensure the .llvm_bb_addr_map is
explicitly placed within its own section.

Signed-off-by: Rong Xu <xur@google.com>
Suggested-by: Will Deacon <will@kernel.org>
Tested-by: Yabin Cui <yabinc@google.com>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 arch/Kconfig                    | 4 ----
 arch/arm64/kernel/vmlinux.lds.S | 3 +++
 arch/x86/Kconfig                | 1 -
 3 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index e510c585ea84..e4eaca9c917c 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -879,12 +879,8 @@ config AUTOFDO_CLANG
 
 	  If unsure, say N.
 
-config ARCH_SUPPORTS_PROPELLER_CLANG
-	bool
-
 config PROPELLER_CLANG
 	bool "Enable Clang's Propeller build"
-	depends on ARCH_SUPPORTS_PROPELLER_CLANG
 	depends on CC_IS_CLANG && CLANG_VERSION >= 190000
 	help
 	  This option enables Clang’s Propeller build. When the Propeller
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index e1ac876200a3..44a42e7c66cf 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -368,6 +368,9 @@ SECTIONS
 
 	STABS_DEBUG
 	DWARF_DEBUG
+#ifdef CONFIG_PROPELLER_CLANG
+        .llvm_bb_addr_map : { *(.llvm_bb_addr_map) }
+#endif
 	MODINFO
 	ELF_DETAILS
 
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 10bf3984102e..b875d2f27e48 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -130,7 +130,6 @@ config X86
 	select ARCH_SUPPORTS_LTO_CLANG
 	select ARCH_SUPPORTS_LTO_CLANG_THIN
 	select ARCH_SUPPORTS_RT
-	select ARCH_SUPPORTS_PROPELLER_CLANG    if X86_64
 	select ARCH_USE_BUILTIN_BSWAP
 	select ARCH_USE_CMPXCHG_LOCKREF		if X86_CX8
 	select ARCH_USE_MEMTEST
-- 
2.54.0.794.g4f17f83d09-goog