linux-kernel - Re: [PATCH] scripts/checksyscalls.sh: only whine perf_counter

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Date:	Fri, 12 Jun 2009 11:29:27 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts/checksyscalls.sh: only whine perf_counter_open 
	when supported

On Fri, Jun 12, 2009 at 11:21, Ingo Molnar wrote:
> * Mike Frysinger <vapier.adi@...il.com> wrote:
>> the perf counter code explicitly requires:
>> ...
>>  - support for atomic64 types (unless i missed something, x86 is the
>> only 32bit system that supports these)
>
> A wrapper suffices - should probably be librarized into lib/.

wonder if we can trick Arnd into doing that ...

>>  - some perf stubs (like set_perf_counter_pending() -- prototype
>> really should be in common perf_counters headers rather than forcing
>> the arch to copy & paste the exact same line)
>
> Agreed.

can i assume you'll take care of that ?

>> not that any of this is documented ...
>
> Patches are welcome :-)

i cant find anything in Documentation/ covering perf counters.  did i
miss some file ?

also, i was going just by a quick compile test.  dont know what else
is actually required since there's no chance of me trying to get this
to work on Blackfin anytime soon ...

> You are right that the requirements are not necessarily trivial for
> every arch - so i guess our original patch is correct.

there is also some ptrace type piece missing for the Blackfin arch,
but that looks like something that i should just implement as everyone
else is doing it.
-mike
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