linux-kernel - Re: [UBI UBIFS] replace vmalloc with kmalloc

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Message-ID: <20090807232846.34bffdeb@ustc>
Date:	Fri, 7 Aug 2009 23:28:46 +0800
From:	JiSheng Zhang <jszhang3@...il.com>
To:	Adrian Hunter <adrian.hunter@...ia.com>
Cc:	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"rmk@....linux.org.uk" <rmk@....linux.org.uk>,
	"Bityutskiy Artem (Nokia-D/Helsinki)" <Artem.Bityutskiy@...ia.com>
Subject: Re: [UBI UBIFS] replace vmalloc with kmalloc

Adrian Hunter <adrian.hunter@...ia.com> wrote:
> 
> vmalloc allows large (> 128KiB) buffers, but kmalloc doesn't.
> So we presently have no choice but to use vmalloc.

But vmalloced buffer can't be easily passed to DMA, is there better choice?

> 
> I do not know what hardware you have or exactly what driver you
> are using, but we have UBIFS on OneNAND using DMA.

An arm soc board, the controller driver hasn't been merged upstream.
> See drivers/mtd/onenand/omap2.c
>

One limit of the omap2.c is that the buffer passed to DMA can't be larger than
PAGESIZE?

Jisheng

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