From: JiSheng Zhang <jszhang3@gmail.com>
To: Adrian Hunter <adrian.hunter@nokia.com>
Cc: "dwmw2@infradead.org" <dwmw2@infradead.org>,
"linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"rmk@arm.linux.org.uk" <rmk@arm.linux.org.uk>,
"Bityutskiy Artem \(Nokia-D/Helsinki\)"
<Artem.Bityutskiy@nokia.com>
Subject: Re: [UBI UBIFS] replace vmalloc with kmalloc
Date: Fri, 7 Aug 2009 23:28:46 +0800 [thread overview]
Message-ID: <20090807232846.34bffdeb@ustc> (raw)
In-Reply-To: <4A7BF1C3.4050602@nokia.com>
Adrian Hunter <adrian.hunter@nokia.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
WARNING: multiple messages have this Message-ID (diff)
From: JiSheng Zhang <jszhang3@gmail.com>
To: Adrian Hunter <adrian.hunter@nokia.com>
Cc: "linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"dwmw2@infradead.org" <dwmw2@infradead.org>,
"rmk@arm.linux.org.uk" <rmk@arm.linux.org.uk>,
"Bityutskiy Artem (Nokia-D/Helsinki)"
<Artem.Bityutskiy@nokia.com>
Subject: Re: [UBI UBIFS] replace vmalloc with kmalloc
Date: Fri, 7 Aug 2009 23:28:46 +0800 [thread overview]
Message-ID: <20090807232846.34bffdeb@ustc> (raw)
In-Reply-To: <4A7BF1C3.4050602@nokia.com>
Adrian Hunter <adrian.hunter@nokia.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
next prev parent reply other threads:[~2009-08-07 15:20 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-07 9:02 [UBI UBIFS] replace vmalloc with kmalloc JiSheng Zhang
2009-08-07 9:02 ` JiSheng Zhang
2009-08-07 9:14 ` Matthieu CASTET
2009-08-07 9:14 ` Matthieu CASTET
2009-08-07 9:20 ` Adrian Hunter
2009-08-07 9:20 ` Adrian Hunter
2009-08-07 9:44 ` Russell King
2009-08-07 9:44 ` Russell King
2009-08-07 14:26 ` Josh Boyer
2009-08-07 14:26 ` Josh Boyer
2009-08-07 15:28 ` JiSheng Zhang [this message]
2009-08-07 15:28 ` JiSheng Zhang
2009-08-09 5:35 ` Artem Bityutskiy
2009-08-09 5:35 ` Artem Bityutskiy
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