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

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Message-ID: <20090613210018.GA1962@elte.hu>
Date:	Sat, 13 Jun 2009 23:00:18 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Frysinger <vapier.adi@...il.com>
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


* Mike Frysinger <vapier.adi@...il.com> wrote:

> 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 ...

FYI, Paul has posted the patches for generic atomic64_t today.

So the barrier of entry to perfcounters enablement is really low 
now, even for 32-bit architectures without 64-bit atomic ops.

	Ingo
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