From: Ingo Oeser <ingo.oeser@informatik.tu-chemnitz.de>
To: linux-kernel@vger.kernel.org
Cc: Robert Williamson <robbiew@us.ibm.com>, Paul Larson <plars@us.ibm.com>
Subject: Re: [ANNOUNCE] Linux Test Project October Release Available
Date: Wed, 9 Oct 2002 13:39:01 +0200 [thread overview]
Message-ID: <20021009133901.T642@nightmaster.csn.tu-chemnitz.de> (raw)
In-Reply-To: <3DA33BF1.3F43E5C0@digeo.com>; from akpm@digeo.com on Tue, Oct 08, 2002 at 01:11:29PM -0700
On Tue, Oct 08, 2002 at 01:11:29PM -0700, Andrew Morton wrote:
> Robert Williamson wrote:
> >
> > ...
> > - Fix for "writev01" to check for EINVAL on ( Paul Larson )
> > 2.5.35 and above kernels
> >
>
> whoa. I've been asleep. The 2.4 kernel _does_ return zero
> if passed a zero segment count.
>
> So we need to fix 2.5 to do that as well. Sure, the spec
> appears to allow either, but given that, we should preserve
> the 2.4 behaviour.
I agree. Passing zero counts means "no work to do" and passing
that information is never a problem in any function.
The same goes for a segment with zero len (which is a way to
measure user space to kernel driver latency, if the driver
implements writev and readv).
It's only a "performance bug", if that is used in a real
application, no wrong parameters.
Regards
Ingo Oeser
--
Science is what we can tell a computer. Art is everything else. --- D.E.Knuth
prev parent reply other threads:[~2002-10-09 16:44 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-08 19:37 Robert Williamson
2002-10-08 20:11 ` Andrew Morton
2002-10-09 11:39 ` Ingo Oeser [this message]
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