From: David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
To: arnd-r2nGTMty4D4@public.gmane.org
Cc: geert.uytterhoeven-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
michal.simek-g5w7nrANp4BDPfheJLI6IQ@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: Removing __kernel_old_uid_t, git_t, dev_t
Date: Mon, 30 Mar 2009 14:11:56 -0700 (PDT) [thread overview]
Message-ID: <20090330.141156.62568451.davem@davemloft.net> (raw)
In-Reply-To: <200903301717.57184.arnd-r2nGTMty4D4@public.gmane.org>
From: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
Date: Mon, 30 Mar 2009 17:17:56 +0200
> dma_addr_t is a big mess that was traditionally defined per
> architecture, in lots of wrong ways, including the misconception
> of dma64_addr_t. Sparc64 still uses a 32 bit dma_addr_t, possibly
> because it always uses an IOMMU (?). It can save some space in
> scatterlists, but might come back to bite us if someone tries
> to build a sparc64 system with actual 64-bit DMA.
There is no reason to use anything larger than a 32-bit DMA address
type on sparc64, and using 32-bit saves lots of space in many
data structures so I am unlikely to ever change this. :-)
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next prev parent reply other threads:[~2009-03-30 21:11 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <49D071A8.4010703@petalogix.com>
2009-03-30 13:58 ` Removing __kernel_old_uid_t, git_t, dev_t Arnd Bergmann
2009-03-30 14:41 ` Geert Uytterhoeven
[not found] ` <10f740e80903300741h387e6342veba0ccceea6714e9-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-03-30 15:17 ` Arnd Bergmann
[not found] ` <200903301717.57184.arnd-r2nGTMty4D4@public.gmane.org>
2009-03-30 21:11 ` David Miller [this message]
[not found] ` <20090330.141156.62568451.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2009-03-31 0:26 ` Arnd Bergmann
2009-04-01 14:11 ` [RFC] asm-generic/{unistd,types,posix_types}.h for new arch Arnd Bergmann
[not found] ` <200904011611.53355.arnd-r2nGTMty4D4@public.gmane.org>
2009-04-01 14:39 ` Will Newton
2009-04-01 15:04 ` Arnd Bergmann
2009-04-01 21:20 ` H. Peter Anvin
2009-04-01 21:32 ` Roland McGrath
[not found] ` <20090401213219.7B324FC3AB-nL1rrgvulkc2UH6IwYuUx0EOCMrvLtNR@public.gmane.org>
2009-04-02 13:06 ` Arnd Bergmann
2009-04-01 17:55 ` Arnd Bergmann
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