linux-kernel - Re: [PATCHv4 02/10] fbdev: ssd1307fb: Allocate page aligned video memory.

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Message-ID: <20150318173805.GU4638@lukather>
Date:	Wed, 18 Mar 2015 18:38:05 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Thomas Niederprüm <niederp@...sik.uni-kl.de>
Cc:	plagnioj@...osoft.com, tomi.valkeinen@...com,
	kernel@...gutronix.de, shawn.guo@...aro.org, robh+dt@...nel.org,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 02/10] fbdev: ssd1307fb: Allocate page aligned video
 memory.

On Mon, Mar 16, 2015 at 06:11:50PM +0100, Thomas Niederprüm wrote:
> Currently the videomemory is allocated by kmalloc, making it a memory
> region that is not necessarily page aligend. This leads to problems
> upon mmap call, where the video memory's address gets aligned to the
> next page boundary. The result is that the userspace program that issued
> the mmap call is not able to access the video memory from the start to
> the next page boundary.
> 
> This patch changes the allocation of the video memory to use
> __get_free_pages() in order to obtain memory that is aligned
> to page boundaries.
> 
> Signed-off-by: Thomas Niederprüm <niederp@...sik.uni-kl.de>

Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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