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Date: Sun, 9 Feb 2014 13:39:07 +0100 From: Ingo Molnar <mingo@...nel.org> To: linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, x86@...nel.org Subject: Re: [PROBLEM] x86: result of verify_local_APIC() is ignored * Jon <nuxi@...lt24.org> wrote: > In arch/x86/kernel/apic/apic.c there is a function called > verify_local_APIC() that does some APIC checks. The part where it writes > to the APIC ID register can cause CPU #15 to not come online under > VMware ESXi on 32-bit kernels if the virtual hardware version is 8. > > I noticed that Ingo actually removed this exact chunk of code from > arch/i386/kernel/apic.c in 2.6.4, but since it was left in the x86_64 > copy it came back when the two were merged. > http://permalink.gmane.org/gmane.linux.kernel.commits.head/27538 > > The Intel architecture manuals seem to agree and notes that the recent > Intel CPUs do not allow writing to the register which means that > machines are actually failing this check... which doesn't matter becuase > none of the callers are checking the return value of this function > anyway. I guess we could remove that from the 64-bit code too. Would you like to send a tested patch? Thanks, Ingo -- 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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