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Message-ID: <92645B27BF79D04FBD2B0F8494FFD0F91F2222@G1W3649.americas.hpqcorp.net> Date: Wed, 19 Dec 2012 10:36:00 +0000 From: "Zhang, Lin-Bao (Linux Kernel R&D)" <linbao.zhang@...com> To: Yinghai Lu <yinghai@...nel.org> CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>, "mingo@...hat.com" <mingo@...hat.com>, "tglx@...utronix.de" <tglx@...utronix.de>, "hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>, "a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>, "jarkko.sakkinen@...el.com" <jarkko.sakkinen@...el.com>, "joerg.roedel@....com" <joerg.roedel@....com>, "agordeev@...hat.com" <agordeev@...hat.com> Subject: RE: Why Linux kernel forced to enter X2APIC mode( just because of booting cpu has supported x2apic) without depending on BIOS' setting in MSR->x2apic enablement bit ? Hi Yinghai , Actually ,my question like this: OS can really enable x2apic correctly without BIOS' help in this case : BIOS has claimed definitely it doesn't enable x2apic ,but OS feel it can enable x2apic(based on BSP supports x2apic) ). If Linux don't need BIOS' help , how did linux kernel reach this action? I am reading this related code, I just see Linux kernel judge cpu_has_x2apic() ,if yes, it will set MSR, certainly , IR works right. We can think BIOS' supporting is not necessary ? Thanks very much . -- Bob(LinBao Zhang) HP linux kernel enginner -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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