RE: [Linux-ia64] Re: memcpy failure

From: Chen, Kenneth W <>
Date: 2002-11-15 07:32:20
Here is the patch that I promised.

Bjorn, would you please apply it to the 2.4 tree? and
David, would you please apply it to the 2.5 tree?


- Ken

-----Original Message-----
From: Chen, Kenneth W 
Sent: Thursday, November 14, 2002 7:53 AM
To: Matthew Wilcox; Christian Cotte-Barrot
Subject: RE: [Linux-ia64] Re: memcpy failure

> >On Thu, Nov 14, 2002 at 10:01:44AM +0100, Christian Cotte-Barrot wrote:
> > But memcpy from memcpy.S is returning a pointer to dest area.
> > That would lead to quasi non-portable code when the return from memcopy
> > is correctly checked depending on which memcopy function is addressed.
> > But BTW, is it meaningful to take into account a return code
> > that is always the same and which value is known in advance ?
> > Does memcpy suppose to failed in some cases ?

> no, memcpy cannot fail (you get a SIGSEGV in userspace or an MCA in
> kernel space).  checking the return value is meaningless.

That's what I feel as well that it is kind of silly to return something that the caller already has. BUt then, I'm not here to judge the specification ;-)

Anyhow, the fix is fairly easy and won't affect the code size as well as the copy throughput, I should have a patch ready shortly to make everyone happy!

- Ken

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Received on Thu Nov 14 12:32:24 2002

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