Commit-ID: 27571616385af9c2d6a3e570b06baf86f5aa04b1
Gitweb: http://git.kernel.org/tip/27571616385af9c2d6a3e570b06baf86f5aa04b1
Author: Lukas Wunner <lukas@xxxxxxxxx>
AuthorDate: Tue, 6 Sep 2016 08:05:32 +0200
Committer: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
CommitDate: Fri, 9 Sep 2016 16:08:56 +0100
x86/efi: Optimize away setup_gop32/64 if unused
Commit 2c23b73c2d02 ("x86/efi: Prepare GOP handling code for reuse
as generic code") introduced an efi_is_64bit() macro to x86 which
previously only existed for arm arches. The macro is used to
choose between the 64 bit or 32 bit code path in gop.c at runtime.
However the code path that's going to be taken is known at compile
time when compiling for x86_32 or for x86_64 with mixed mode disabled.
Amend the macro to eliminate the unused code path in those cases.
Size of gop.o text section:
CONFIG_X86_32: 1758 before, 1299 after
CONFIG_X86_64 && !CONFIG_EFI_MIXED: 2201 before, 1406 after
CONFIG_X86_64 && CONFIG_EFI_MIXED: 2201 before and after
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Signed-off-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/efi.h | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index 4630e2b..f14655e 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -206,14 +206,23 @@ struct efi_config {
__pure const struct efi_config *__efi_early(void);
+static inline bool efi_is_64bit(void)
+{
+ if (!IS_ENABLED(CONFIG_X86_64))
+ return false;
+
+ if (!IS_ENABLED(CONFIG_EFI_MIXED))
+ return true;
+
+ return __efi_early()->is64;
+}
+
#define efi_call_early(f, ...) \
__efi_early()->call(__efi_early()->f, __VA_ARGS__);
#define __efi_call_early(f, ...) \
__efi_early()->call((unsigned long)f, __VA_ARGS__);
-#define efi_is_64bit() __efi_early()->is64
-
extern bool efi_reboot_required(void);
#else
--
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