linux-kernel - Re: [PATCH 01/10] perf, trace: Remove IRQ-disable from perf/tracepoint interaction

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Message-ID: <20100523121159.GB3194@brick.ozlabs.ibm.com>
Date:	Sun, 23 May 2010 22:11:59 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/10] perf, trace: Remove IRQ-disable from
 perf/tracepoint interaction

On Fri, May 21, 2010 at 11:02:02AM +0200, Peter Zijlstra wrote:

>  	entry = (struct trace_entry *)raw_data;
> -	tracing_generic_entry_update(entry, *irq_flags, pc);
> +	tracing_generic_entry_update(entry, regs->flags, pc);
>  	entry->type = type;

This is breaking on powerpc -- we don't have a "flags" element in
struct pt_regs.  What is it trying to do?  Get the interrupt enable
state, as local_irq_save(flags) would provide?

Paul.
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