Re: [rfc] [patch] kernel hooks

Richard J Moore (richardj_moore@uk.ibm.com)
Thu, 3 Oct 2002 14:32:50 +0100


> You must also ensure that the code you are modifying isnt on an IRQ path
> (if it is you must do spin locks and then be very careful about cross
> cpu tlb deadlocks). Finally you have no choice but to ensure you never
> use it on the NMI path

Why do we need a spinlock? We change one byte, we are not concered about
when exactly that takes effect, only that there are always valid
instructions in the pipeline.

Richard.

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