linux-kernel - [PATCH 31/33] efi/libstub/x86: Avoid getter function for efi

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Date:   Fri, 24 Apr 2020 15:05:29 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     linux-efi@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Ard Biesheuvel <ardb@...nel.org>, linux-kernel@...r.kernel.org,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Atish Patra <atish.patra@....com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Zou Wei <zou_wei@...wei.com>
Subject: [PATCH 31/33] efi/libstub/x86: Avoid getter function for efi_is64

We no longer need to take special care when using global variables
in the EFI stub, so switch to a simple symbol reference for efi_is64.

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 arch/x86/include/asm/efi.h              | 11 ++++++++---
 drivers/firmware/efi/libstub/x86-stub.c |  8 --------
 2 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index 78e839925a81..cd0c3fbf6156 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -225,14 +225,19 @@ efi_status_t efi_set_virtual_address_map(unsigned long memory_map_size,
 
 /* arch specific definitions used by the stub code */
 
-__attribute_const__ bool efi_is_64bit(void);
+extern const bool efi_is64;
+
+static inline bool efi_is_64bit(void)
+{
+	if (IS_ENABLED(CONFIG_EFI_MIXED))
+		return efi_is64;
+	return IS_ENABLED(CONFIG_X86_64);
+}
 
 static inline bool efi_is_native(void)
 {
 	if (!IS_ENABLED(CONFIG_X86_64))
 		return true;
-	if (!IS_ENABLED(CONFIG_EFI_MIXED))
-		return true;
 	return efi_is_64bit();
 }
 
diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
index bddbc103a34b..597793fe8d22 100644
--- a/drivers/firmware/efi/libstub/x86-stub.c
+++ b/drivers/firmware/efi/libstub/x86-stub.c
@@ -21,16 +21,8 @@
 #define MAXMEM_X86_64_4LEVEL (1ull << 46)
 
 const efi_system_table_t *efi_system_table;
-extern const bool efi_is64;
 extern u32 image_offset;
 
-__attribute_const__ bool efi_is_64bit(void)
-{
-	if (IS_ENABLED(CONFIG_EFI_MIXED))
-		return efi_is64;
-	return IS_ENABLED(CONFIG_X86_64);
-}
-
 static efi_status_t
 preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom)
 {
-- 
2.17.1