From: Ralf Baechle <ralf@linux-mips.org>
To: James Bottomley <James.Bottomley@steeleye.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Linux Arch list <linux-arch@vger.kernel.org>
Subject: Re: More DMA API junk
Date: Tue, 16 Mar 2004 12:17:47 +0100 [thread overview]
Message-ID: <20040316111747.GA1592@linux-mips.org> (raw)
In-Reply-To: <1079408930.2158.408.camel@mulgrave>
On Mon, Mar 15, 2004 at 10:48:48PM -0500, James Bottomley wrote:
> You're confused about what it's used for. It's designed only to be
> called on memory allocated by dma_alloc_noncoherent() and tells you if
> that API actually returned coherent memory or not. This was designed
... but what is coherent? The API's function naming is completly confusing
at least from a MIPS perspective. MIPS calls something coherent if
cache coherency is maintained by hardware and that's (hey, what caches?!?)
not the case for uncached memory.
So I would like to rename functions to something less confusing. Where
did the original terminology come from? Would anybody object simply
swapping the coherent and noncoherent parts of the function names?
Ralf
prev parent reply other threads:[~2004-03-16 11:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-16 0:53 More DMA API junk Benjamin Herrenschmidt
2004-03-16 1:12 ` James Bottomley
2004-03-16 1:32 ` Benjamin Herrenschmidt
2004-03-16 3:24 ` James Bottomley
2004-03-16 3:32 ` Benjamin Herrenschmidt
2004-03-16 3:48 ` James Bottomley
2004-03-16 3:53 ` Benjamin Herrenschmidt
2004-03-16 11:17 ` Ralf Baechle [this message]
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