linux-kernel - Re: [PATCH] video: fbdev: uvesafb: use CONFIG_X86_PAE surround _PAGE

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Date:	Thu, 6 Mar 2014 18:33:50 +0800
From:	Wang YanQing <udknight@...il.com>
To:	Tomi Valkeinen <tomi.valkeinen@...com>
Cc:	plagnioj@...osoft.com, fengguang.wu@...el.com,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] video: fbdev: uvesafb: use CONFIG_X86_PAE surround
 _PAGE_NX check code

On Thu, Mar 06, 2014 at 11:56:37AM +0200, Tomi Valkeinen wrote:
> I don't like this, I think this makes the code more messy, just to avoid
> that warning.
> 
> And it might even be buggy. For your patch to work correctly, you need
> to know the internals of _PAGE_NX, i.e. that when CONFIG_X86_PAE is not
> defined, _PAGE_NX is 0. But the driver should not depend on things like
> that. If _PAGE_NX is changed later, the driver will not work correctly.
> 

Very right! Thanks.




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