Commit-ID: b16d8c231e4d03fefc7de1b8b62bad5659ee8070
Gitweb: http://git.kernel.org/tip/b16d8c231e4d03fefc7de1b8b62bad5659ee8070
Author: Matt Fleming <matt.fleming@xxxxxxxxx>
AuthorDate: Tue, 5 Aug 2014 00:12:19 +0100
Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Mon, 4 Aug 2014 16:26:46 -0700
x86/efi: Fix 3DNow optimization build failure in EFI stub
Building a 32-bit kernel with CONFIG_X86_USE_3DNOW and CONFIG_EFI_STUB
leads to the following build error,
drivers/firmware/efi/libstub/lib.a(efi-stub-helper.o): In function `efi_relocate_kernel':
efi-stub-helper.c:(.text+0xda5): undefined reference to `_mmx_memcpy'
This is due to the fact that the EFI boot stub pulls in the 3DNow
optimized versions of the memcpy() prototype from
arch/x86/include/asm/string_32.h, even though the _mmx_memcpy()
implementation isn't available in the EFI stub.
For now, predicate CONFIG_EFI_STUB on !CONFIG_X86_USE_3DNOW. This is
most definitely a temporary fix. A complete solution will involve
selectively including kernel headers/symbols into the early-boot
execution environment of the EFI boot stub, i.e. something analogous to
the way that the _SETUP symbol is used.
Previous attempts have been made to fix this kind of problem, though
none seem to have ever been merged,
http://lkml.kernel.org/r/20120329104822.GA17233@xxxxxxxxxxxxxxx
Clearly, this problem has been around for a long time.
Reported-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1407193939-27813-1-git-send-email-matt@xxxxxxxxxxxxxxxxx
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
---
arch/x86/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 801ed36..7ea8aaa 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1536,7 +1536,7 @@ config EFI
config EFI_STUB
bool "EFI stub support"
- depends on EFI
+ depends on EFI && !X86_USE_3DNOW
---help---
This kernel feature allows a bzImage to be loaded directly
by EFI firmware without the use of a bootloader.
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