linux-kernel - Re: BUG: null pointer deref in dmar_ir

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Message-ID: <20100402182034.GA27304@elte.hu>
Date:	Fri, 2 Apr 2010 20:20:34 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	"Jan.Grossmann@...lnet.net" <Jan.Grossmann@...lnet.net>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	"Woodhouse, David" <david.woodhouse@...el.com>,
	"Han, Weidong" <weidong.han@...el.com>,
	"Song, Youquan" <youquan.song@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"stable@...nel.org" <stable@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: BUG: null pointer deref in dmar_ir_support


* Suresh Siddha <suresh.b.siddha@...el.com> wrote:

> @@ -1640,8 +1640,10 @@ int __init APIC_init_uniprocessor(void)
>  	}
>  #endif
>  
> +#ifndef CONFIG_SMP
>  	enable_IR_x2apic();
>  	default_setup_apic_routing();
> +#endif

Instead of adding yet another ugly #ifdef please hide these details properly, 
by making enable_IR_x2apic() and default_setup_apic_routing() a NOP on !SMP.

Thanks,

	Ingo
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