From: Johannes Erdfelt <johannes@erdfelt.com>
To: linux-usb-devel@lists.sourceforge.net
Cc: Manfred Spraul <manfred@colorfullife.com>,
David Brownell <david-b@pacbell.net>,
Russell King <rmk@arm.linux.org.uk>,
zaitcev@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [linux-usb-devel] Re: SLAB vs. pci_alloc_xxx in usb-uhci patch [RFC: API]
Date: Fri, 9 Mar 2001 13:35:03 -0500 [thread overview]
Message-ID: <20010309133502.R31345@sventech.com> (raw)
In-Reply-To: <001f01c0a5c0$e942d8f0$5517fea9@local> <00d401c0a5c6$f289d200$6800000a@brownell.org> <20010305232053.A16634@flint.arm.linux.org.uk> <15012.27969.175306.527274@pizda.ninka.net> <055e01c0a8b4$8d91dbe0$6800000a@brownell.org> <3AA91B2C.BEB85D8C@colorfullife.com> <15017.7950.106874.276894@pizda.ninka.net>
In-Reply-To: <15017.7950.106874.276894@pizda.ninka.net>; from David S. Miller on Fri, Mar 09, 2001 at 10:21:02AM -0800
On Fri, Mar 09, 2001, David S. Miller <davem@redhat.com> wrote:
> Manfred Spraul writes:
> > Do lots of drivers need the reverse mapping? It wasn't on my todo list
> > yet.
>
> I am against any API which provides this. It can be extremely
> expensive to do this on some architectures, and since the rest
> of the PCI dma API does not provide such an interface neither
> should the pool routines.
The API I hacked together for uhci.c didn't have this.
> Drivers can keep track of this kind of information themselves,
> and that is what I tell every driver author to do who complains
> of a lack of a "bus_to_virt()" type thing, it's just lazy
> programming.
Once I worked around not having a "bus_to_virt()" type thing I was happier
with the resulting code. I completely agree.
JE
next prev parent reply other threads:[~2001-03-09 18:36 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-05 22:08 SLAB vs. pci_alloc_xxx in usb-uhci patch Manfred Spraul
2001-03-05 22:52 ` David Brownell
2001-03-05 23:20 ` Russell King
2001-03-06 2:09 ` Alan Cox
2001-03-06 2:29 ` [linux-usb-devel] " David Brownell
2001-03-06 4:53 ` David S. Miller
2001-03-09 16:18 ` SLAB vs. pci_alloc_xxx in usb-uhci patch [RFC: API] David Brownell
[not found] ` <3AA91B2C.BEB85D8C@colorfullife.com>
2001-03-09 18:21 ` David S. Miller
2001-03-09 18:35 ` Johannes Erdfelt [this message]
2001-03-09 19:42 ` [linux-usb-devel] " David Brownell
2001-03-09 20:07 ` David S. Miller
2001-03-09 21:14 ` David Brownell
2001-03-09 22:34 ` Pete Zaitcev
2001-03-09 18:35 ` Alan Cox
2001-03-09 18:29 ` David Brownell
2001-03-09 19:14 ` Pete Zaitcev
2001-03-09 19:37 ` David Brownell
2001-03-09 19:04 ` Gérard Roudier
2001-03-09 22:42 ` David Brownell
2001-03-09 21:07 ` Gérard Roudier
2001-03-10 3:11 ` David Brownell
2001-03-09 20:00 ` David S. Miller
2001-03-09 21:38 ` [linux-usb-devel] " Alan Cox
2001-03-09 20:07 ` David S. Miller
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