linux-kernel - Re: [PATCH 1/3] perf events: fix WARN_ON

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Date:	Fri, 18 Feb 2011 12:00:21 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Ahern <daahern@...co.com>
Cc:	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu, acme@...stprotocols.net, paulus@...ba.org
Subject: Re: [PATCH 1/3] perf events: fix WARN_ON_ONCE for 64-bit raw data,
 SW events

On Thu, 2011-02-17 at 22:53 -0700, David Ahern wrote:
> This check does not work out for 64-bit counter:
> 
>     sizeof(u32) + sizeof(u64) = 4 + 8 = 12
> 
> which does not pass the WARN_ON_ONCE test. I'm guessing (hoping
> really) that the intent is that the size of the raw data is a
> multiple of 4 bytes, not 8.

No the data must come in 8bytes strides.

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