linux-kernel - RE: [PATCH] unicore32 framebuffer driver fix: make videomemory kmalloc-ed and floatable

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Date:	Wed, 30 Mar 2011 16:43:52 +0800
From:	"Guan Xuetao" <gxt@...c.pku.edu.cn>
To:	"'Arnd Bergmann'" <arnd@...db.de>
Cc:	"'Paul Mundt'" <lethal@...ux-sh.org>,
	<linux-kernel@...r.kernel.org>, <linux-fbdev@...r.kernel.org>
Subject: RE: [PATCH] unicore32 framebuffer driver fix: make videomemory kmalloc-ed and floatable



> -----Original Message-----
> From: Arnd Bergmann [mailto:arnd@...db.de]
> Sent: Wednesday, March 30, 2011 2:54 PM
> To: Guan Xuetao
> Cc: 'Paul Mundt'; linux-kernel@...r.kernel.org; linux-fbdev@...r.kernel.org
> Subject: Re: [PATCH] unicore32 framebuffer driver fix: make videomemory kmalloc-ed and floatable
> 
> On Wednesday 30 March 2011 03:39:26 Guan Xuetao wrote:
> > > How does this work? UNIFB_MEMSIZE seems to be 4 MB, much more than the
> > > maximum of 128 KB that kmalloc can allocate.
> > >
> > > Shouldn't this use get_free_pages() instead of kmalloc?
> > >
> >
> > When using SLUB allocator, if required memory size  is larger
> > than 2*PAGE_SIZE, kmalloc_large is called,
> > and eventually __get_free_pages will  be called.
> > So,  it would be the same as __get_free_pages.
> 
> Ok, I see. It's probably still better to use __get_free_pages directly,
> because it's possible to select a different allocator that does not
> do this itself.
> 
> 	Arnd
Is it appropriate to using __get_free_pages in framebuffer driver?
And both SLAB and SLUB allocators support 4MB request.

Thanks & Regards.

Guan Xuetao


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