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Message-ID: <86802c441001121110u2f3dcfbpafb0d9c4bb6a4e4d@mail.gmail.com>
Date:	Tue, 12 Jan 2010 11:10:19 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"stable@...nel.org" <stable@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Subject: Re: [PATCH] Make Intel 8-way Xeons boot again

if the system can not use logical flat.

should have some bit set in FADT...

static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
#ifdef CONFIG_ACPI
        /*
         * Quirk: some x86_64 machines can only use physical APIC mode
         * regardless of how many processors are present (x86_64 ES7000
         * is an example).
         */
        if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
                (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
                printk(KERN_DEBUG "system APIC only can use physical flat");
                return 1;
        }
#endif

        return 0;
}
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