linux-kernel - Re: lib/iomap.c mmio_{in,out}s* vs. __raw

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 05 Nov 2006 09:17:18 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Russell King <rmk+lkml@....linux.org.uk>
Cc:	Linus Torvalds <torvalds@...l.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Jeff Garzik <jgarzik@...ox.com>, Andrew Morton <akpm@...l.org>,
	"David S. Miller" <davem@...emloft.net>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: lib/iomap.c mmio_{in,out}s* vs. __raw_* accessors

On Sat, 2006-11-04 at 14:06 +0000, Russell King wrote:
> On Sat, Nov 04, 2006 at 06:52:41PM +1100, Benjamin Herrenschmidt wrote:
> > In fact, I would be very very very much in favor of, instead of the
> > above, defining a set of:
> > 
> > readsb, readsw, readsl, readsq
> > writesb, writesw, writesl, writesq
> 
> ARM already has these.  Sounds like a good idea for everyone else to also
> implement them. 8)

Ok, powerpc will have these in 2.6.20 then :-)

I'm tempted to remove those mmio_* things from iomap.c completely. I
need to check who uses them, but in all cases, I don't see what they do
in iomap.c, it's not their place.

Versions that would transparently use MMIO or PIO would make sense. A
pure MMIO implementation doesn't, that has to be arch specific. It makes
the generic iomap suddently non-portable in some ways.

So I think we need to make sure all archs grow readsb,sw,sl etc... and
just have iomap use those for the "transparent" versions.

Ben.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/