linux-kernel - Re: x86: Inconsistent xAPIC synchronization in arch_irq_work

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Message-ID: <20140122184325.GY20765@two.firstfloor.org>
Date:	Wed, 22 Jan 2014 19:43:25 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: x86: Inconsistent xAPIC synchronization in arch_irq_work_raise?

> > Huang Ying, can you explain to Jan why you do the wait afterwards?
> 
> I borrow the code from the original MCE report event code.
> 
> Andi, could you help us to explain it?

I don't recall all the details, but I believe i also just copied 
it from the APIC code. I don't think I did any particular ordering
intentionally.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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