linux-kernel - Re: [PATCH] x86/apic: check FADT settings after enable x2apic

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Date:	Sun, 27 Jan 2013 22:57:35 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Wang, Song-Bo (Stoney)" <song-bo.wang@...com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	"Zhang, Lin-Bao (Linux Kernel R&D)" <linbao.zhang@...com>,
	"Pearson, Greg" <greg.pearson@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"suresh.b.siddha@...el.com" <suresh.b.siddha@...el.com>
Subject: Re: [PATCH] x86/apic: check FADT settings after enable x2apic

On Sun, Jan 27, 2013 at 9:05 PM, Wang, Song-Bo (Stoney)
<song-bo.wang@...com> wrote:
> Hi Yinghai, hpa and others,
>
> Would you please review the patch on detecting x2apic FADT settings?
>
> We meet a BIOS system which works on x2apic physical mode by setting the bit ACPI_FADT_APIC_PHYSICAL in FADT table.
> And for those systems with all cpuid < 255, the spec requires BIOS's default mode in xapic.
> The kernel detects the default mode and do some initializations and will call enable_IR_x2apic and change the mode to x2apic successfully.

Hi, Peter and Ingo,

I checked the patch, and looks right.

I updated the changelog and simplify the code a little bit.

Please check if you can put it into tip:x86/apic

Thanks

Yinghai

Download attachment "wang_hp_x2apic.patch" of type "application/octet-stream" (2646 bytes)