linux-kernel - [PATCH 6/6] x86/compressed: only build mem_encrypt.S if AMD_MEM

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Date:   Mon, 15 Aug 2022 15:42:23 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     linux-efi@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Michael Roth <michael.roth@....com>
Subject: [PATCH 6/6] x86/compressed: only build mem_encrypt.S if AMD_MEM_ENCRYPT=y

Avoid building the mem_encrypt.o object if memory encryption support is
not enabled to begin with.

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 arch/x86/boot/compressed/Makefile      | 2 +-
 arch/x86/boot/compressed/mem_encrypt.S | 3 ---
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index d6dbb46696a2..9aad9ddcf3b4 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -99,7 +99,7 @@ vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o
 ifdef CONFIG_X86_64
 	vmlinux-objs-y += $(obj)/ident_map_64.o
 	vmlinux-objs-y += $(obj)/idt_64.o $(obj)/idt_handlers_64.o
-	vmlinux-objs-y += $(obj)/mem_encrypt.o
+	vmlinux-objs-$(CONFIG_AMD_MEM_ENCRYPT) += $(obj)/mem_encrypt.o
 	vmlinux-objs-y += $(obj)/pgtable_64.o
 	vmlinux-objs-$(CONFIG_AMD_MEM_ENCRYPT) += $(obj)/sev.o
 endif
diff --git a/arch/x86/boot/compressed/mem_encrypt.S b/arch/x86/boot/compressed/mem_encrypt.S
index b4a116283bd9..fad0978d6799 100644
--- a/arch/x86/boot/compressed/mem_encrypt.S
+++ b/arch/x86/boot/compressed/mem_encrypt.S
@@ -56,8 +56,6 @@ SYM_FUNC_START(get_sev_encryption_bit)
 	RET
 SYM_FUNC_END(get_sev_encryption_bit)
 
-#ifdef CONFIG_AMD_MEM_ENCRYPT
-
 /**
  * sev_es_req_cpuid - Request a CPUID value from the Hypervisor using
  *		      the GHCB MSR protocol
@@ -312,4 +310,3 @@ SYM_DATA_START_LOCAL(boot32_idt_desc)
 	.word   . - boot32_idt - 1
 	.long   0
 SYM_DATA_END(boot32_idt_desc)
-#endif
-- 
2.35.1