linux-kernel - Re: [PATCH] x86: cleanup reloated

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Date:	Sat, 14 Jun 2008 12:27:04 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: cleanup reloated_initrd

On Sat, Jun 14, 2008 at 11:41 AM, H. Peter Anvin <hpa@...or.com> wrote:
> Yinghai Lu wrote:
>>
>> 1. move that before zone_sizes_init ...
>> 2. add free_early for one old one, otherwise it will be be reserved again
>> when
>>   init highmem.
>>
>> Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
>>
>> Index: linux-2.6/arch/x86/kernel/setup_32.c
>> ===================================================================
>> --- linux-2.6.orig/arch/x86/kernel/setup_32.c
>> +++ linux-2.6/arch/x86/kernel/setup_32.c
>> @@ -585,6 +585,9 @@ static void __init relocate_initrd(void)
>>        printk(KERN_INFO "Copied RAMDISK from %016llx - %016llx to %08llx -
>> %08llx\n",
>>                ramdisk_image, ramdisk_image + ramdisk_size - 1,
>>                ramdisk_here, ramdisk_here + ramdisk_size - 1);
>> +
>> +       /* need to free that, otherwise init highmem will reserve it again
>> */
>> +       free_early(ramdisk_image, ramdisk_image+ramdisk_size);
>>  }
>>
>
> I'm somewhat confused by this... you realize that the old location and the
> new location of the initrd will overlap, right?

Ying Huang add page_is_reserved_early check in
add_one_highpage_init(), so reserve_early high address will be
reserved when in init high. that is not wanted old initrd in high
region we will lose some ram

Also I have produced another patch to make init high to use
early_node_map aka active regions. and will sort it out.

anyway, remove that from early_res is some cleanup.

YH
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