linux-kernel - Re: [PATCH v2] X86: Hook apic vector allocation domain only when interrupt routing are set to ignore

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Message-ID: <20140427183401.GB19657@tassilo.jf.intel.com>
Date:	Sun, 27 Apr 2014 11:34:01 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Oren Twaig <oren@...lemp.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Shai Fultheim <shai@...lemp.com>
Subject: Re: [PATCH v2] X86: Hook apic vector allocation domain only when
 interrupt routing are set to ignore

On Sun, Apr 27, 2014 at 09:57:59AM +0300, Oren Twaig wrote:
> Hi Andi,
> 
> On 04/25/2014 05:22 PM, Andi Kleen wrote:
> >> +static int irc = 1;
> > Using a static for such state is very unusual. You need to describe what
> > protects it against races and why that is needed over a cleaner solution.
> 
> The only reason I've used a static variable is because I wanted to avoid
> inserting another code/functions which are depended on CONFIG_PCI.  The code is
> used once during initialization and hence cannot be racy.

Again, what lock protects it?

If you cannot answer that question you likely shouldn't use static.

-Andi
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