linux-kernel - Re: prevent swsusp with PAE

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Message-Id: <20060831104304.e3514401.akpm@osdl.org>
Date:	Thu, 31 Aug 2006 10:43:04 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Pavel Machek <pavel@...e.cz>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: prevent swsusp with PAE

On Thu, 31 Aug 2006 15:53:36 +0200
Pavel Machek <pavel@...e.cz> wrote:

> If HIGHMEM64G and swsusp are used at the same time, nasty random
> crashes happen during resume. Cause is known; prevent that
> combination.
> 
> I guess I'd like to see this one in 2.6.18...
> 
> Signed-off-by: Pavel Machek <pavel@...e.cz>
> 
> ---
> commit acb3b411ec93f827b25b8481d53670c5c9195d89
> tree f52cd5518e34af16fe5ae28064717bcc95929f28
> parent cd03e183c58e6e7073e054a7fe335cf50c61fe2f
> author <pavel@....ucw.cz> Thu, 31 Aug 2006 15:52:34 +0200
> committer <pavel@....ucw.cz> Thu, 31 Aug 2006 15:52:34 +0200
> 
>  include/asm-i386/suspend.h |    8 ++++++++
>  1 files changed, 8 insertions(+), 0 deletions(-)
> 
> diff --git a/include/asm-i386/suspend.h b/include/asm-i386/suspend.h
> index 08be1e5..01cd812 100644
> --- a/include/asm-i386/suspend.h
> +++ b/include/asm-i386/suspend.h
> @@ -16,6 +16,15 @@ arch_prepare_suspend(void)
>  		printk(KERN_ERR "PSE is required for swsusp.\n");
>  		return -EPERM;
>  	}
> +
> +#ifdef CONFIG_X86_PAE
> +	printk(KERN_ERR "swsusp is incompatible with PAE.\n");
> +	/* This is actually instance of the same problem. We need
> +	   identity mapping self-contained in swsusp_pg_dir, and PAE
> +	   prevents that. Solution could be copied from x86_64. */
> +	return -EPERM;
> +#endif
> +
>  	return 0;
>  }

Why not do this in Kconfig??
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