[lkml]   [2018]   [Nov]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH v11 3/5] x86/boot: Add get_acpi_rsdp() to parse RSDP in cmdlien from kexec
On Wed, Nov 14, 2018 at 09:54:50AM +0800, Chao Fan wrote:
> CONFIG_KEXEC is only needed in this function.
> When searching RSDP, there are three methods in order:
> 1. When booting from KEXEC, 'acpi_rsdp' is added to cmdline by KEXEC,
> so it can be parsed and used. CONFIG_KEXEC is needed here.

But theoretically acpi_rsdp can be supplied by the first kernel too,

So you don't need that CONFIG_KEXEC here at all?

> >Ok, let's recap: so far, for your use case you need:
> >
> >and now
> >
> >So, you can clean up all that ifdeffery by defining a new config item
> >CONFIG_EARLY_PARSE_RSDP or so which depends on all those three items and
> >then you can do
> >
> >vmlinux-objs-$(CONFIG_EARLY_PARSE_RSDP) += $(obj)/acpitb.o
> >
> >and get rid of the most of the ifdeffery.

Regardless of CONFIG_KEXEC - you still need to define a CONFIG_ symbol
for your use case. We won't be parsing RSDP early on !MEMORY_HOTREMOVE
machines, which is the majority.


Good mailing practices for 400: avoid top-posting and trim the reply.

 \ /
  Last update: 2018-11-14 19:34    [W:0.066 / U:4.404 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site