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SubjectRe: [PATCH 01/22] ARM: add mechanism for late code patching
On Wed, Aug 08, 2012 at 09:55:12AM -0400, Nicolas Pitre wrote:
> On Wed, 8 Aug 2012, Cyril Chemparathy wrote:
> > Neat macro magic. Are you thinking that we build this in as a self test in
> > the code?
>
> For such things, this is never a bad idea to have some test alongside
> with the main code, especially if this is extended to more cases in the
> future. It is too easy to break it in subtle ways.
>
> See arch/arm/kernel/kprobes-test*.c for a precedent.

Done correctly, it shouldn't be a problem, but I wouldn't say that
arch/arm/kernel/kprobes-test*.c is done correctly. It's seen quite
a number of patching attempts since it was introduced for various
problems, and I've seen quite a number of builds fail for various
reasons in this file (none which I could be bothered to investigate.)

When the test code ends up causing more problems than the code it's
testing, something is definitely wrong.


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