x86: Don't use the EFI reboot method by default

commit f70e957cda22d309c769805cbb932407a5232219 upstream.

Testing suggests that at least some Lenovos and some Intels will
fail to reboot via EFI, attempting to jump to an unmapped
physical address. In the long run we could handle this by
providing a page table with a 1:1 mapping of physical addresses,
but for now it's probably just easier to assume that ACPI or
legacy methods will be present and reboot via those.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alan Cox <alan@linux.intel.com>
Link: http://lkml.kernel.org/r/1309985557-15350-1-git-send-email-mjg@redhat.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
[PG: in 2.6.34, file is x86/platform/efi/efi.c --> x86/kernel/efi.c]
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/arch/x86/kernel/efi.c b/arch/x86/kernel/efi.c
index c2fa9b8b497e082cd703f2e2e0f9b03319bdd2e6..0084548e47428d12b00df613f6065d0fab35104a 100644 (file)
--- a/arch/x86/kernel/efi.c
+++ b/arch/x86/kernel/efi.c
@@ -459,9 +459,6 @@ void __init efi_init(void)
        x86_platform.set_wallclock = efi_set_rtc_mmss;
 #endif
 
-       /* Setup for EFI runtime service */
-       reboot_type = BOOT_EFI;
-
 #if EFI_DEBUG
        print_efi_memmap();
 #endif