Re: [PATCH] Athlon/Opteron Prefetch Fix for 2.6.0test5 + numbers

[Kai Henningsen]

ak@xxxxxxx (Andi Kleen)  wrote on 17.09.03 in <20030917211200.GA5997@xxxxxxxxxxxxx>:

> On Wed, Sep 17, 2003 at 01:50:59PM -0700, Linus Torvalds wrote:

> > Also, you do things like comparing pointers for less/greater than, and at
> > least some versions of gcc has done that wrong - using signed comparisons.
>
> Really? Is that any version we still support (2.95+) ?
> It is certainly legal ISO-C. I changed it for now.

It certainly is *not* legal ISO C, and never was.

Pointer comparision is *only* legal in ISO C if both pointers point to the  
same object - same variable, or same piece of malloc'd memory. Anything  
else is undefined.

MfG Kai
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