linux-kernel - Re: Perhaps a side effect regarding NMI returns

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Message-ID: <1322654168.2921.257.camel@twins>
Date:	Wed, 30 Nov 2011 12:56:08 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Jason Baron <jbaron@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Paul Turner <pjt@...gle.com>
Subject: Re: Perhaps a side effect regarding NMI returns

On Tue, 2011-11-29 at 17:51 -0500, Steven Rostedt wrote:
> static void run_sync(void)
> {
>         int enable_irqs = irqs_disabled();
> 
>         /* We may be called with interrupts disbled. */
>         if (enable_irqs)
>                 local_irq_enable();
>         on_each_cpu(do_sync_core, NULL, 1);
>         if (enable_irqs)
>                 local_irq_disable();
> }
> 
> Note, it's fine to enable interrupts here, it's only used by ftrace. 

Still ugly as hell though, why not push that pain to the caller?
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