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

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Date:	Sun, 27 Apr 2014 09:57:59 +0300
From:	Oren Twaig <oren@...lemp.com>
To:	Andi Kleen <ak@...ux.intel.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

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.

But, if static variables are unusual (new at linux kernel), I will change the
flow to read the HW state again (using the PCI functions).  Please let me know if that is desirable.

Thanks,
   Oren.

>
> -Andi

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