Re: [RFC][PATCH] x86: make text_poke() atomic

[Mathieu Desnoyers]

* Arjan van de Ven (arjan@xxxxxxxxxxxxx) wrote:
> > 
> > Use map_vm_area() instead of vmap() in text_poke() for avoiding page
> > allocation and delayed unmapping, and call vunmap_page_range() and
> > local_flush_tlb() directly because this mapping is temporary and
> > local.
> > 
> > At the result of above change, text_poke() becomes atomic and can be
> > called from stop_machine() etc.
> 
> .... but text_poke() realistically needs to call stop_machine() since
> you can't poke live code.... so that makes me wonder how useful this
> is...

Hi Arjan,

Stop machine is not required when inserting a breakpoint. And cleverly
using this breakpoint technique can permit modifying other instructions
as well.

Mathieu

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Mathieu Desnoyers
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