All of lore.kernel.org
 help / color / mirror / Atom feed
From: Dave Young <dyoung@redhat.com>
To: Khalid Aziz <khalid@gonehiking.org>
Cc: horms@verge.net.au, kexec@lists.infradead.org, vgoyal@redhat.com
Subject: Re: [PATCH]kdump: pass noefi and acpi_rsdp= to 2nd kernel
Date: Mon, 22 Oct 2012 10:05:46 +0800	[thread overview]
Message-ID: <5084A9FA.1090403@redhat.com> (raw)
In-Reply-To: <1350572394.3894.18.camel@rhapsody>

On 10/18/2012 10:59 PM, Khalid Aziz wrote:

> On Thu, 2012-10-18 at 11:12 +0800, Dave Young wrote:
>> 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.
>>
> 
> Hi Dave,
> 
> I suspect EFI based systems with Compatibility Support Module (CSM) are
> still not going to need this, but I can see native EFI systems with no
> CSM needing this. I have reviewed your patch.


Good to know, I have no CSM machine to test. Since Simon has applied the
patch, I think I can improve this issue later If I can find a machine
with CSM.

> 
> BTW, I am no longer at HP, so <khalid.aziz@hp.com> is no longer valid.
> <khalid@gonehiking.org> is my permanent personal email address.


Thanks for reminding.

> 
> --
> Khalid
> 
> 
> _______________________________________________
> kexec mailing list
> kexec@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec



-- 
Thanks
Dave

_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

  reply	other threads:[~2012-10-22  2:09 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-05  5:44 [PATCH]kdump: pass noefi and acpi_rsdp= to 2nd kernel Dave Young
2012-09-05  7:45 ` Simon Horman
2012-09-06  2:48   ` Dave Young
2012-09-05 13:18 ` Vivek Goyal
2012-09-06  2:58   ` Dave Young
2012-09-06 20:46     ` Vivek Goyal
2012-09-05 23:09 ` Khalid Aziz
2012-09-06  3:18   ` Dave Young
2012-09-06 17:57     ` Khalid Aziz
2012-09-07  8:56       ` Dave Young
2012-09-07 14:37         ` Khalid Aziz
2012-09-13 13:38           ` Vivek Goyal
2012-09-14 20:32             ` Khalid Aziz
2012-09-20  7:49               ` Eric W. Biederman
2012-09-21 22:50                 ` Khalid Aziz
2012-09-12  2:35         ` Dave Young
2012-10-18  3:12           ` Dave Young
2012-10-18 14:59             ` Khalid Aziz
2012-10-22  2:05               ` Dave Young [this message]
2012-09-06 20:24   ` Vivek Goyal
2012-09-07 14:32     ` Khalid Aziz

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=5084A9FA.1090403@redhat.com \
    --to=dyoung@redhat.com \
    --cc=horms@verge.net.au \
    --cc=kexec@lists.infradead.org \
    --cc=khalid@gonehiking.org \
    --cc=vgoyal@redhat.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.