linux-kernel - Re: [PATCH] x86/apic: Fix suspicious RCU usage in smp_trace_call_function

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Message-ID: <alpine.DEB.2.20.1610121516220.8572@nanos>
Date:   Wed, 12 Oct 2016 15:17:50 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Wanpeng Li <kernellwp@...il.com>
cc:     Peter Zijlstra <peterz@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Wanpeng Li <wanpeng.li@...mail.com>
Subject: Re: [PATCH] x86/apic: Fix suspicious RCU usage in
 smp_trace_call_function_interrupt

On Wed, 12 Oct 2016, Wanpeng Li wrote:
> irq_enter() which is called in scheduler_ipi() is too late to tell RCU
> susbstems to end the extended quiescent state before ack_APIC_irq(),
> any ideas?

You can call irq_enter/exit() in __smp_reschedule_interrupt(). It can be
called nested.

Thanks,

	tglx