[PATCH v2] kdump: pass acpi_rsdp= to 2nd kernel for efi booting

[Khalid Aziz]

On Thu, 2012-10-18 at 11:10 +0800, Dave Young wrote:
> In case efi booting, kdump need kernel parameter acpi_rsdp= to retrieve
> the acpi root table physical address.
> 
> Add a function cmdline_add_efi to get the address from /sys/firmware/efi/systab
> If there's no such file or read fail the function will just do nothing.
> 
> Tested efi boot Fedora 17 on thinkpad T420.
> 
> Some background info for this issue:
> http://lists.infradead.org/pipermail/kexec/2010-March/003889.html
> 
> [v1 -> v2]:
> Address comments from Khalid and Simon
> use fgets instead of read(2) to iterate the file
> do not add 'noefi' because kexec does not construct EFI signature
> in bootloader signature in boot_params, so kexec'd kernel will
> disable EFI automatically even without noefi.
> 
> Signed-off-by: Dave Young <dyoung at redhat.com>
> ---
>  kexec/arch/i386/crashdump-x86.c |   35 +++++++++++++++++++++++++++++++++++
>  1 file changed, 35 insertions(+)


Looks good.

Reviewed-by: Khalid Aziz <khalid at gonehiking.org>