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

Dave Young dyoung at redhat.com
Wed Oct 17 23:12:20 EDT 2012

On 09/12/2012 10:35 AM, Dave Young wrote:

> 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.

During recent test, I found I mistakenly used wrong kernel config
without CONFIG_EFI in 1st kernel for testing. acpi_rsdp= is still needed.

Just resent the v2 patch, please help to review.


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