linux-kernel - Re: [Xen-devel] [PATCH 2/3] xen: eliminate scalability issues from initrd handling

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Date:	Thu, 4 Sep 2014 15:53:23 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>,
	David Vrabel <david.vrabel@...rix.com>
CC:	Juergen Gross <JGross@...e.com>, <boris.ostrovsky@...cle.com>,
	<xen-devel@...ts.xensource.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 2/3] xen: eliminate scalability issues from
 initrd handling

On 04/09/14 15:29, Jan Beulich wrote:
>>>> On 04.09.14 at 14:52, <david.vrabel@...rix.com> wrote:
>> On 04/09/14 13:38, Juergen Gross wrote:
>>> --- a/arch/x86/xen/xen-head.S
>>> +++ b/arch/x86/xen/xen-head.S
>>> @@ -124,6 +124,9 @@ NEXT_HYPERCALL(arch_6)
>>>  	ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,
>>>  		.quad _PAGE_PRESENT; .quad _PAGE_PRESENT)
>>>  	ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1)
>>> +#ifdef CONFIG_X86_64
>>> +	ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN,  .long 1)
>>> +#endif
>>
>> Why X86_64 only?  If there's a good reason the commit message needs to
>> explain why.
> 
> Does native 32-bit support huge initrd?

Does that matter? If the MOD_START_PFN options works with a 32-bit guest
then it should use it, regardless of whether it is essential or not.
Because this reduces the #ifdef'ery.

David
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