From mboxrd@z Thu Jan 1 00:00:00 1970 Received: by rv-out-0910.google.com with SMTP id f1so740086rvb.26 for ; Sun, 30 Mar 2008 19:23:07 -0700 (PDT) Message-ID: <86802c440803301923m29b6a0coca7f61975331cbe5@mail.gmail.com> Date: Sun, 30 Mar 2008 19:23:07 -0700 From: "Yinghai Lu" Subject: Re: [PATCH 8/8] x86_64: Support for new UV apic In-Reply-To: <20080331021224.GB20619@sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20080328191216.GA16455@sgi.com> <86802c440803301622j2874ca56t51b52a54920a233b@mail.gmail.com> <86802c440803301833r2229900cw99129515822dc373@mail.gmail.com> <20080331021224.GB20619@sgi.com> Sender: owner-linux-mm@kvack.org Return-Path: To: Jack Steiner Cc: Andi Kleen , mingo@elte.hu, tglx@linutronix.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: On Sun, Mar 30, 2008 at 7:12 PM, Jack Steiner wrote: > > > Did you test it on non UV_X2APIC box? > > > > anyway the read_apic_id is totally wrong, even for your UV_X2APIC box. > > because id=apic_read(APIC_ID) will have apic_id at bits [31,24], and > > id |= __get_cpu_var(x2apic_extra_bits) is assuming that is on bits [5,0] > > > > so you even didn't test in your UV_X2APIC box! > > > > It works fine on UV_X2APIX boxes because the double shift does > not occur. However, support for UV_X2APIC is dependent on > x2apic code that is not yet in the tree. Once the APIC > is switched into x2apic mode, the apicid is located in the LOW > bits of the apicid register, not the HIGH bits. oh, so that will need have new version GET_APIC_ID too. YH -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org