Messages in this thread | | | Date | Tue, 25 Aug 2009 12:36:23 -0700 | From | Yinghai Lu <> | Subject | Re: [patch] x86: 2.6.31-rc7 crash due to buggy flat_phys_pkg_id |
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Ravikiran G Thirumalai wrote: > On Tue, Aug 25, 2009 at 11:50:56AM -0700, Yinghai Lu wrote: >> Cyrill Gorcunov wrote: >> >> initial apic id and apic id could be different. >> >> and we should use initial apic id to get correct phys pkg id in case BIOS set crazy apic id. >> > > Is there a specific bug we are fixing here? Again, this behavior was > present from atleast 2.6.15-2.6.30 on 'flat' and older 'cluster' apics, and intel > documentation suggests local apic be used. Is there a specific bios bug > that is being fixed? > > (The BIOS is not supposed to set a crazy apic ID. The BIOS is buggy in that
we can not stop BIOS doing crazy thing.
for AMD 8 socket 4 cores system. BSP apic id : 4 or 8, and initial apic id is 0:
with apic id in phys_pkg_id, will get pkg id: 1, 2, ...
with initial apic id will get pkg id: 0, 1, 2, 3.
when I was working on LinuxBIOS, I did have one porting to have BSP: 0 AP: start from 5, 6, 7... that will have strange in pkg_id.
YH
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