From: James Bottomley <James.Bottomley@steeleye.com>
To: Joel Soete <jsoe0708@tiscali.be>
Cc: parisc-linux@parisc-linux.org
Subject: Re: [parisc-linux] backport bitops.h stuff
Date: 01 Aug 2003 10:59:02 -0500 [thread overview]
Message-ID: <1059753543.2092.30.camel@mulgrave> (raw)
In-Reply-To: <3F29178A000004C6@ocpmta7.freegates.net>
On Fri, 2003-08-01 at 10:28, Joel Soete wrote:
> Can somebody help me to ci inot 2.4 this patch which backport ffs() needed
> for new devmapper ;)
Actually, this patch looks decidedly non-optimal.
See include/linux/bitops.h:generic_ffs for how it should be done on
architectures that don't have any machine instruction help. That's only
four if statements and no loop.
I see we already have the loop thing in 2.5, but should we consider
simply using the generic operations there as well?
even for __ffs, which is just a slight optimisation over ffs, using
generic_ffs would probably be faster
James
next prev parent reply other threads:[~2003-08-01 15:59 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-01 15:28 [parisc-linux] backport bitops.h stuff Joel Soete
2003-08-01 15:35 ` Joel Soete
2003-08-01 15:59 ` James Bottomley [this message]
2003-08-01 17:09 ` Joel Soete
2003-08-01 17:14 ` LaMont Jones
2003-08-01 17:25 ` Joel Soete
2003-08-01 17:33 ` James Bottomley
2003-08-04 10:43 ` Joel Soete
2003-08-04 15:14 ` LaMont Jones
2003-08-04 16:08 ` James Bottomley
2003-08-04 17:04 ` Joel Soete
2003-08-04 16:53 ` Joel Soete
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