Re: [PATCH] C undefined behavior fix

From: Paul Mackerras (
Date: Fri Jan 04 2002 - 17:14:38 EST

Florian Weimer writes:

> Paul Mackerras <> writes:
> > One of the reasons why C is a good language for the kernel is that its
> > memory model is a good match to the memory organization used by the
> > processors that linux runs on. Thus, for these processors, adding an
> > offset to a pointer is in fact simply an arithmetic addition.
> But this is not the memory model of C! Adding an offset to a pointer
> is an operation involving objects defined by the C language, and not
> machine registers. Sometimes, this makes a noticeable difference.

Sorry, you are correct. I should have written "One of the reasons why
C used to be a good language for writing operating system kernels ..."

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