linux-kernel - Re: [PATCH] perf_counter: remove the event config bitfields

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Message-ID: <18885.32067.929534.488134@cargo.ozlabs.ibm.com>
Date:	Sun, 22 Mar 2009 10:50:27 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf_counter: remove the event config bitfields

Peter Zijlstra writes:

> Paul, I noticed you assign the raw config without mask, is that ok?

Yep.  That doesn't get assigned directly to a hardware register; it
undergoes further processing first, which just pulls out the bits it
needs.  (It's not used directly because the hardware has a couple of
registers that configure all the counters at once, rather than a
configuration register per counter.)

Paul.
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