[PATCH]kdump: pass noefi and acpi_rsdp= to 2nd kernel

[Khalid Aziz]

On Fri, 2012-09-07 at 16:56 +0800, Dave Young wrote:
> Actually in x86 setup code if bootloader do not pass correct efi_info in
> boot_params efi_enabled will be set to 0 automaticlly.
> 

When we kexec a kernel, the EFI signature is missing in the bootloader
signature in boot_params, so kexec'd kernels currently disable EFI
automatically even without noefi in this code:

arch/x86/kernel/setup.c:

733         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
734                      "EL32", 4)) {
735                 efi_enabled = 1;
736                 efi_64bit = false;
737         } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signatu     re,             
738                      "EL64", 4)) {
739                 efi_enabled = 1;
740                 efi_64bit = true;
741         }

efi_enabled is initialized to 0.

-- 
Khalid Aziz <khalid.aziz at hp.com>