Re: [PATCH] 2.6.18-rt7: PowerPC: fix breakage in threaded fasteoitype IRQ handlers
From: Sergei Shtylyov
Date: Sun Nov 19 2006 - 15:30:43 EST
Hello.
Ingo Molnar wrote:
What do you need an ack() for on fasteoi ? On all fasteoi controllers
I have, ack is implicit by obtaining the vector number and all there
is is an eoi...
it's a compatibility hack only. Threaded handlers are a different type
of flow, but often the fasteoi handler is not changed to the threaded
handler so i changed it to be a threaded handler too.
The fasteoi flow seem to only had been used for x86 IOAPIC in the RT patch
only *before* PPC took to using them in the mainline...
threaded handlers need a mask() + an ack(), because that's the correct
Not all of them. This could be customized on type-by-type basis. I.e. we
could call eoi() instead of ack() for fasteoi chips without having to resort
to the duplicated ack/eoi handlers.
model to map them to kernel threads - threaded handlers can be delayed
for a long time if something higher-prio is preempting them.
Ingo
WBR, Sergei
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