LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Al Viro <viro@ftp.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Tejun Heo <htejun@gmail.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Jeff Garzik <jgarzik@pobox.com>,
	linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org
Subject: Re: [PATCH] iomap: make PCI iomap stuff excluded when PCI isn't configured
Date: Sat, 10 Feb 2007 23:55:53 +0000	[thread overview]
Message-ID: <20070210235553.GP10050@ftp.linux.org.uk> (raw)
In-Reply-To: <20070210225033.GO10050@ftp.linux.org.uk>

On Sat, Feb 10, 2007 at 10:50:33PM +0000, Al Viro wrote:
> We don't even require ioremap().  What the hell could it possibly mean on
> e.g. UML?  The same goes for DMA.  And yes, of course it means that a lot
> of drivers are not buildable on it - hardly a surprise, that...

FWIW, the current picture wrt io-related stuff looks so:

alpha frv i386 ia64 mips parisc powerpc sparc64 x86_64: full set
s390: no ioport_map, no ioread*/iowrite*, no port IO except for (in|out)b(_p|)
sparc: insl() and friends are not there unless we have PCI, ioremap() is
not exported unless on PCI.
um: odd stubs for inb()/outb(), no other port IO; no ioremap(), no
memcpy_..io(), for some reason read[bwlq]()/write[bwlq]() are there,
but never used.  No ioread*/iowrite*.
arm: depends on subarchitecture.  E.g. 32bit port access might be a sham
(causes fun problems with e.g. modular ide-core on some subarchitectures -
it doesn't _use_ insl(), but the reference is there no matter what, so the
lack of export => missing symbol).
m68k: as if.  No ioread/iowrite, ioremap() only for hp300, availability of
any IO accessor depends on config in rather weird ways.
m32r: no ioread/iowrite/ioport_map
the rest of embedded stuff: no idea, never played with those targets.

  reply	other threads:[~2007-02-10 23:56 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-10 11:43 [patch] More defines for dma-mapping-broken.h Heiko Carstens
2007-02-10 17:43 ` [PATCH] iomap: make PCI iomap stuff excluded when PCI isn't configured Tejun Heo
2007-02-10 19:46   ` Heiko Carstens
2007-02-10 22:14     ` Tejun Heo
2007-02-10 22:25       ` Linus Torvalds
2007-02-10 22:50         ` Al Viro
2007-02-10 23:55           ` Al Viro [this message]
2007-02-11 16:45             ` Martin Schwidefsky
2007-02-11 18:15               ` Al Viro
2007-02-11  0:15       ` Heiko Carstens
2007-02-11  5:20       ` Al Viro
2007-02-11  2:41   ` Randy Dunlap
2007-02-11 15:49 ` [patch] More defines for dma-mapping-broken.h Jeff Garzik

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20070210235553.GP10050@ftp.linux.org.uk \
    --to=viro@ftp.linux.org.uk \
    --cc=akpm@linux-foundation.org \
    --cc=heiko.carstens@de.ibm.com \
    --cc=htejun@gmail.com \
    --cc=jgarzik@pobox.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-s390@vger.kernel.org \
    --cc=schwidefsky@de.ibm.com \
    --cc=torvalds@linux-foundation.org \
    --subject='Re: [PATCH] iomap: make PCI iomap stuff excluded when PCI isn'\''t configured' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).