linux-kernel - RE: [RFC] arm:extend the reserved mrmory for initrd to be page aligned

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Date:	Mon, 15 Sep 2014 17:07:53 +0800
From:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>
To:	'Russell King - ARM Linux' <linux@....linux.org.uk>
CC:	'Will Deacon' <will.deacon@....com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'linux-arm-kernel@...ts.infradead.org'" 
	<linux-arm-kernel@...ts.infradead.org>,
	"'linux-mm@...ck.org'" <linux-mm@...ck.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: RE: [RFC] arm:extend the reserved mrmory for initrd to be page
 aligned

Hi

I tested it on my phone,
>From log:
<4>[    0.000000] INITRD unalign phys address:0x02000000+0x0022fb0e
<4>[    0.000000] INITRD aligned phys address:0x02000000+0x00230000

<4>[    0.579474] free_initrd_mem: free pfn:8192---8752

The tail address is not aligned for most initrd image,
This page will not be freed and lost .

This patch have a limitation that the tail page's not used
Part should not be reserved by any other driver,
And must be memory .
This is true for most bootloaders ,
And we will print error if it is false .

Thanks


-----Original Message-----
From: Russell King - ARM Linux [mailto:linux@....linux.org.uk] 
Sent: Monday, September 15, 2014 4:46 PM
To: Wang, Yalin
Cc: 'Will Deacon'; 'linux-kernel@...r.kernel.org'; 'linux-arm-kernel@...ts.infradead.org'; 'linux-mm@...ck.org'; linux-arm-msm@...r.kernel.org
Subject: Re: [RFC] arm:extend the reserved mrmory for initrd to be page aligned

On Mon, Sep 15, 2014 at 01:11:14PM +0800, Wang, Yalin wrote:
> this patch extend the start and end address of initrd to be page 
> aligned, so that we can free all memory including the un-page aligned 
> head or tail page of initrd, if the start or end address of initrd are 
> not page aligned, the page can't be freed by free_initrd_mem() function.

Have you tested this patch?  If so, how thorough was your testing?

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