From: Ralf Baechle <ralf@linux-mips.org>
To: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: geert@linux-m68k.org, jsun@mvista.com, linux-mips@linux-mips.org
Subject: Re: semaphore woes in 2.6, 32bit
Date: Mon, 10 May 2004 16:06:06 +0200 [thread overview]
Message-ID: <20040510140606.GA9312@linux-mips.org> (raw)
In-Reply-To: <20040510.222845.78701815.anemo@mba.ocn.ne.jp>
On Mon, May 10, 2004 at 10:28:45PM +0900, Atsushi Nemoto wrote:
> >> Hmm, many drivers use kmalloc and pci_map_single for DMA buffer.
> >> So ARCH_KMALLOC_MINALIGN should be L1_CACHE_BYTES for non-coherent
> >> system?
>
> ralf> No, those drivers are simply broken. dma_get_cache_alignment()
> ralf> gives the mimimum alignment and width for DMA mappings and that
> ralf> value is larger than kmalloc alignment in almost all cases.
>
> I see. Thank you for pointing out it. I must learn 2.6 DMA API
> quickly ...
This also applies to the 2.4 PCI DMA API.
Ralf
next prev parent reply other threads:[~2004-05-10 14:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-08 1:10 semaphore woes in 2.6, 32bit Jun Sun
2004-05-08 7:18 ` Ralf Baechle
2004-05-09 5:48 ` Jun Sun
2004-05-09 9:09 ` Geert Uytterhoeven
2004-05-09 12:57 ` Ralf Baechle
2004-05-09 13:56 ` Atsushi Nemoto
2004-05-09 16:48 ` Ralf Baechle
2004-05-10 13:28 ` Atsushi Nemoto
2004-05-10 14:06 ` Ralf Baechle [this message]
2004-05-11 13:53 ` Atsushi Nemoto
2004-05-11 14:05 ` Ralf Baechle
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