[PATCH v2 10/10] efi/libstub: arm64: Drop zboot code_size hack

From: Ard Biesheuvel <ardb+git@google.com>
To: linux-efi@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org,
	Ard Biesheuvel <ardb@kernel.org>,
	 Jason Gunthorpe <jgg@nvidia.com>, Paul Walmsley <pjw@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	 Albert Ou <aou@eecs.berkeley.edu>,
	Huacai Chen <chenhuacai@kernel.org>,
	loongarch@lists.linux.dev,  linux-riscv@lists.infradead.org
Subject: [PATCH v2 10/10] efi/libstub: arm64: Drop zboot code_size hack
Date: Tue, 10 Nov 2026 13:17:42 +0100	[thread overview]
Message-ID: <20261110121731.2728824-22-ardb+git@google.com> (raw)
In-Reply-To: <20261110121731.2728824-12-ardb+git@google.com>

From: Ard Biesheuvel <ardb@kernel.org>

Now that the code size can be obtained via the generic image_info
struct, there is no longer a need to inject it explicitly during the
build.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/arm64/boot/Makefile               | 3 ---
 arch/arm64/kernel/image-vars.h         | 4 ----
 drivers/firmware/efi/libstub/arm64.c   | 4 +---
 drivers/firmware/efi/libstub/zboot.lds | 4 ----
 4 files changed, 1 insertion(+), 14 deletions(-)

diff --git a/arch/arm64/boot/Makefile b/arch/arm64/boot/Makefile
index d42d07667822..509b59518818 100644
--- a/arch/arm64/boot/Makefile
+++ b/arch/arm64/boot/Makefile
@@ -51,7 +51,4 @@ EFI_ZBOOT_BFD_TARGET	:= elf64-littleaarch64
 EFI_ZBOOT_MACH_TYPE	:= ARM64
 EFI_ZBOOT_FORWARD_CFI	:= $(CONFIG_ARM64_BTI_KERNEL)
 
-EFI_ZBOOT_OBJCOPY_FLAGS	= --add-symbol zboot_code_size=0x$$( \
-				$(NM) vmlinux|grep _kernel_codesize|cut -d' ' -f1)
-
 include $(srctree)/drivers/firmware/efi/libstub/Makefile.zboot
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index 9ab71d103f64..22b242a7a21b 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -144,10 +144,6 @@ KVM_NVHE_ALIAS(kvm_protected_mode_initialized);
 
 #endif /* CONFIG_KVM */
 
-#ifdef CONFIG_EFI_ZBOOT
-_kernel_codesize = ABSOLUTE(__inittext_end - _text);
-#endif
-
 /*
  * LLD will occasionally error out with a '__init_end does not converge' error
  * if INIT_IDMAP_DIR_SIZE is defined in terms of _end, as this results in a
diff --git a/drivers/firmware/efi/libstub/arm64.c b/drivers/firmware/efi/libstub/arm64.c
index fdd48ba0f9f1..4399b23fa237 100644
--- a/drivers/firmware/efi/libstub/arm64.c
+++ b/drivers/firmware/efi/libstub/arm64.c
@@ -88,8 +88,6 @@ efi_status_t check_platform_features(void)
 #define DCTYPE	"cvau"
 #endif
 
-u32 __weak code_size;
-
 void efi_cache_sync_image(unsigned long image_base,
 			  unsigned long alloc_size)
 {
@@ -100,7 +98,7 @@ void efi_cache_sync_image(unsigned long image_base,
 	/* only perform the cache maintenance if needed for I/D coherency */
 	if (!(ctr & BIT(CTR_EL0_IDC_SHIFT))) {
 		unsigned long base = image_base;
-		unsigned long size = code_size;
+		unsigned long size = alloc_size;
 
 		do {
 			asm("dc " DCTYPE ", %0" :: "r"(base));
diff --git a/drivers/firmware/efi/libstub/zboot.lds b/drivers/firmware/efi/libstub/zboot.lds
index e1365907f805..e0f0bf005854 100644
--- a/drivers/firmware/efi/libstub/zboot.lds
+++ b/drivers/firmware/efi/libstub/zboot.lds
@@ -2,8 +2,6 @@
 
 ENTRY(__efistub_efi_zboot_header);
 
-PROVIDE(zboot_code_size = ABSOLUTE(0));
-
 SECTIONS
 {
 	.head : ALIGN(4096) {
@@ -22,8 +20,6 @@ SECTIONS
 		*(.rodata* .init.rodata* .srodata*)
 
 		. = ALIGN(4);
-		__efistub_code_size = .;
-		LONG(zboot_code_size);
 		__efistub_efistub_image_info_offset = .;
 		LONG(efistub_image_info_offset);
 
-- 
2.56.0.542.g3ef89b7020-goog

