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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Keith Owens <kaos@ocs.com.au>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] change name of rep_nop 
Date: Tue, 9 Oct 2001 14:13:22 +0200
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>>One approach we take on PPC that you may or may not like for this is
>>dynamic patching.
>
>BIG RED WARNING: Anybody thinking of using dynamic patching must
>consider modules as well as the kernel.  modutils 2.4.8 added support
>for ppc archdata to allow dynamic patching of modules using the ftr
>data.  There also has to be code in kernel/module.c::module_arch_init()
>to take the archdata and do whatever is required.
>
>If anybody starts doing dynamic patching, please let me know so I can
>handle modutils and module_arch_init().

Yes, definitely an issue. The mecanism we used on PPC was so specific
to some low-level arch asm code that modules were a non-issue... until
some of that critical code ended up beeing inlined.

Ben.


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