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
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