linux-kernel - Re: [PATCH] x86: move dmar_table_init out of enable

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Date:	Mon, 17 Aug 2009 15:53:16 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Gleb Natapov <gleb@...hat.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Subject: Re: [PATCH] x86: move dmar_table_init out of enable_IR

On Mon, 2009-08-17 at 13:47 -0700, Yinghai Lu wrote:
> Suresh Siddha wrote:
> > 
> > We can remove this ifdef check, as dmar_table_init() already handles
> > the !config_intr_remap
> > 
> > Also, at this error condition, we should simply return if the cpu has no
> > x2apic support. There is no x2apic support and we failed to enable
> > interrupt-remapping. No need to go further down.
> 
> like this ?
> 
> ---
>  arch/x86/kernel/apic/apic.c |    9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> Index: linux-2.6/arch/x86/kernel/apic/apic.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/apic/apic.c
> +++ linux-2.6/arch/x86/kernel/apic/apic.c
> @@ -1392,14 +1392,11 @@ void __init enable_IR_x2apic(void)
>  	unsigned long flags;
>  	struct IO_APIC_route_entry **ioapic_entries = NULL;
>  	int ret, x2apic_enabled = 0;
> -	int dmar_table_init_ret = 0;
> +	int dmar_table_init_ret;
>  
> -#ifdef CONFIG_INTR_REMAP
>  	dmar_table_init_ret = dmar_table_init();
> -	if (dmar_table_init_ret)
> -		pr_debug("dmar_table_init() failed with %d:\n",
> -				dmar_table_init_ret);
> -#endif
> +	if (dmar_table_init_ret && !x2apic_supported())
> +		return;
>  
>  	ioapic_entries = alloc_ioapic_entries();
>  	if (!ioapic_entries) {

Ack.

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