linux-kernel - Re: [PATCH] ftrace: protect running nmi (V3)

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Date:	Wed, 18 Mar 2009 20:33:28 -0400
From:	Steven Rostedt <srostedt@...hat.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ftrace: protect running nmi (V3)


On Wed, 2009-03-18 at 16:42 +0800, Lai Jiangshan wrote:

>  
> +static void wait_for_nmi_and_set_mod_flag(void)
> +{
> +	if (!atomic_cmpxchg(&nmi_running, 0, MOD_CODE_WRITE_FLAG))
> +		rerurn;

You might want to compile check patches before sending. I'll look this
patch over in detail, and make the necessary fixes.

-- Steve

> +
> +	do {
> +		cpu_relax();
> +	} while (atomic_cmpxchg(&nmi_running, 0, MOD_CODE_WRITE_FLAG));
> +
> +	nmi_wait_count++;
> +}
> +

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