linux-kernel - RE: [patch 4/5] x2apic, IR: remove reinit_intr_remapped_IO

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Date:	Tue, 21 Apr 2009 14:37:21 +0800
From:	"Han, Weidong" <weidong.han@...el.com>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"mingo@...e.hu" <mingo@...e.hu>, "hpa@...or.com" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>
Subject: RE: [patch 4/5] x2apic, IR: remove reinit_intr_remapped_IO_APIC()

Siddha, Suresh B wrote:
> When interrupt-remapping is enabled, We are relying on
> setup_IO_APIC_irqs() 
> to configure remapped entries in the IO-APIC, which comes little bit
> later after enabling interrupt-remapping.
> 
> Meanwhile, Restore of old io-apic entries after enabling
> interrupt-remapping will not make the interrupts through io-apic
> functional anyway. 
> 
> So remove unnecessary reinit_intr_remapped_IO_APIC().
> 
> Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
> Cc: Weidong Han <weidong.han@...el.com>
> ---
> 
> Index: tip/arch/x86/include/asm/io_apic.h
> ===================================================================
> --- tip.orig/arch/x86/include/asm/io_apic.h
> +++ tip/arch/x86/include/asm/io_apic.h
> @@ -166,8 +166,6 @@ extern void free_ioapic_entries(struct I
>  extern int save_IO_APIC_setup(struct IO_APIC_route_entry
>  **ioapic_entries); extern void mask_IO_APIC_setup(struct
>  IO_APIC_route_entry **ioapic_entries); extern int
> restore_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries); 
> -extern void reinit_intr_remapped_IO_APIC(int intr_remapping,
> -	struct IO_APIC_route_entry **ioapic_entries);
> 
>  extern void probe_nr_irqs_gsi(void);
> 
> Index: tip/arch/x86/kernel/apic/apic.c
> ===================================================================
> --- tip.orig/arch/x86/kernel/apic/apic.c
> +++ tip/arch/x86/kernel/apic/apic.c
> @@ -1416,8 +1416,6 @@ end_restore:
>  		 * IR enabling failed
>  		 */
>  		restore_IO_APIC_setup(ioapic_entries);
> -	else
> -		reinit_intr_remapped_IO_APIC(x2apic_preenabled, ioapic_entries);

Whether IR enabling succeeds or fails, it always needs to restore old IOAPIC entries. Due to removing reinit_intr_remapped_IO_APIC here, it needs to also remove the "if (ret)" before restore_IO_APIC_setup(ioapic_entries);

Regards,
Weidong


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