linux-kernel - Re: fix aperture vs. suspend problem

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Message-Id: <20080313153248.f43bbce3.akpm@linux-foundation.org>
Date:	Thu, 13 Mar 2008 15:32:48 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Pavel Machek <pavel@....cz>
Cc:	ak@...e.de, linux-kernel@...r.kernel.org, mingo@...e.hu,
	rjw@...k.pl, len.brown@...el.com, stable@...nel.org
Subject: Re: fix aperture vs. suspend problem

On Thu, 13 Mar 2008 11:05:31 +0100
Pavel Machek <pavel@....cz> wrote:

> 
> aperture_64.c takes a piece of memory and makes it into iommu
> window... but such window may not be saved by swsusp -- that leads to
> oops during suspend.
> 
> Signed-off-by: Pavel Machek <pavel@...e.cz>
> 
> diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
> index 608152a..88747f3 100644
> --- a/arch/x86/kernel/aperture_64.c
> +++ b/arch/x86/kernel/aperture_64.c
> @@ -18,6 +18,7 @@ #include <linux/pci_ids.h>
>  #include <linux/pci.h>
>  #include <linux/bitops.h>
>  #include <linux/ioport.h>
> +#include <linux/suspend.h>
>  #include <asm/e820.h>
>  #include <asm/io.h>
>  #include <asm/gart.h>
> @@ -76,6 +77,7 @@ static u32 __init allocate_aperture(void
>  	printk(KERN_INFO "Mapping aperture over %d KB of RAM @ %lx\n",
>  			aper_size >> 10, __pa(p));
>  	insert_aperture_resource((u32)__pa(p), aper_size);
> +	register_nosave_region((u32)__pa(p) >> PAGE_SHIFT, (u32)__pa(p+aper_size) >> PAGE_SHIFT);
>  
>  	return (u32)__pa(p);
>  }
> 

This is also needed in 2.6.24, perhaps earlier?
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