Re: [PATCH] x86: Don't write io_apic ID if it is not changed

[Cyrill Gorcunov]

On Sun, Aug 15, 2010 at 12:24:46PM +0400, Cyrill Gorcunov wrote:
...
> As far as I see, this was done by a purpose in former code. Consider the
> situation when mp_ioapics[apic_id].apicid >= get_physical_broadcast().
> By code flow (io_apic.c:2099) this set
> 
> 		if (mp_ioapics[apic_id].apicid >= get_physical_broadcast()) {
> 			printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
> 				apic_id, mp_ioapics[apic_id].apicid);
> 			printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
> 				reg_00.bits.ID);
> --->			mp_ioapics[apic_id].apicid = reg_00.bits.ID;
> 		}
> 
> So with your patch we always hit "continue" without real changing of ID which
> is not correct.
> 
> But perhaps I miss something?
> 
> 	-- Cyrill

False alarm Yinghai, of course there is no need to write same value back,
sorry for noise.

	-- Cyrill
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