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

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Date:	Tue, 21 Apr 2009 09:01:30 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Han, Weidong" <weidong.han@...el.com>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"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()


* Han, Weidong <weidong.han@...el.com> wrote:

> 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);

Ok - i skipped this patch for now.

	Ingo
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