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

Dave Young dyoung at redhat.com
Tue Sep 11 22:35:07 EDT 2012

On 09/07/2012 04:56 PM, Dave Young wrote:
> I did some digging about the efi boot kdump in slackware with kernel
> from latest linus tree. I'm surprise that kdump works even without these
> "noefi" and "acpi_rsdp="
> With fedora 17 3.4.3 kernel passing "acpi_rsdp=" is enough for kdump
> kernel booting.
> Actually in x86 setup code if bootloader do not pass correct efi_info in
> boot_params efi_enabled will be set to 0 automaticlly.
> So as for this patch 'noefi' is not needed.
> I will do more testing to see why linus tree works without "acpi_rsdp="

There's probably some efi changes between 3.4.3 - 3.6.0-rc4 cause this
works. I have not got time to bisect it.

Because it works without explicitly passing the kernel param, I will not
update the patch anymore.

Thanks everyone for your comments.


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