]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
x86/efi: Fix 3DNow optimization build failure in EFI stub
authorMatt Fleming <matt.fleming@intel.com>
Mon, 4 Aug 2014 23:12:19 +0000 (00:12 +0100)
committerH. Peter Anvin <hpa@linux.intel.com>
Mon, 4 Aug 2014 23:26:46 +0000 (16:26 -0700)
commitb16d8c231e4d03fefc7de1b8b62bad5659ee8070
tree33bf510153d6fa8e20e12bc8d80ee2f04cb2c65d
parent99a5603e2a1f146ac0c6414d8a3669aa749ccff8
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@x1.osrc.amd.com

Clearly, this problem has been around for a long time.

Reported-by: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@suse.de>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Link: http://lkml.kernel.org/r/1407193939-27813-1-git-send-email-matt@console-pimps.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
arch/x86/Kconfig