linux-kernel - Re: [PATCH 1/2] add helper for highmem checks

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Message-ID: <20130211182826.GE2683@pd.tnic>
Date:	Mon, 11 Feb 2013 19:28:26 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org, hpa@...or.com,
	mingo@...nel.org, tglx@...utronix.de
Subject: Re: [PATCH 1/2] add helper for highmem checks

On Mon, Feb 11, 2013 at 09:32:41AM -0800, Dave Hansen wrote:
> That's crazy. Didn't expect that at all.
>
> I guess X is happier getting an error than getting random pages back.

Yeah, I think this is something special only this window manager wdm
does. The line below has appeared repeatedly in the logs earlier:

Feb  5 23:02:02 a1 wdm: Cannot read randomFile "/dev/mem", errno = 14

This happens when wdm starts so I'm going to guess it uses it for
something funny, "randomFile" it calls it??

With the WARN_ON check added and booting 3.8-rc6, it would choke wdm
somehow and it wouldn't start properly so that even the error out above
doesn't happen. Oh well ...

> I'm working on a set of patches now that should get it _working_
> instead of just returning an error.

Yeah, send them on and I'll run them.

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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