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: <20140425142248.GL8874@tassilo.jf.intel.com>
Date:	Fri, 25 Apr 2014 07:22:48 -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

> diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
> index f6584a9..b7f8e5b 100644
> --- a/arch/x86/kernel/vsmp_64.c
> +++ b/arch/x86/kernel/vsmp_64.c
> @@ -26,6 +26,8 @@
>  
>  #define TOPOLOGY_REGISTER_OFFSET 0x10
>  
> +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.

-Andi
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