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Message-ID: <20200218215325.GE11802@worktop.programming.kicks-ass.net>
Date: Tue, 18 Feb 2020 22:53:25 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: "Luck, Tony" <tony.luck@...el.com>
Cc: Borislav Petkov <bp@...en8.de>,
Steven Rostedt <rostedt@...dmis.org>,
Andy Lutomirski <luto@...nel.org>, x86-ml <x86@...nel.org>,
lkml <linux-kernel@...r.kernel.org>, paulmck@...nel.org
Subject: Re: [RFC] #MC mess
On Tue, Feb 18, 2020 at 10:49:04PM +0100, Peter Zijlstra wrote:
> diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h
> index da0af631ded5..146332764673 100644
> --- a/include/linux/hardirq.h
> +++ b/include/linux/hardirq.h
> @@ -71,7 +71,7 @@ extern void irq_exit(void);
> printk_nmi_enter(); \
> lockdep_off(); \
> ftrace_nmi_enter(); \
> - BUG_ON(in_nmi()); \
> + BUG_ON(in_nmi() == 0xf); \
That wants to be:
BUG_ON(in_nmi() == NMI_MASK); \
> preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET); \
> rcu_nmi_enter(); \
> trace_hardirq_enter(); \
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