linux-kernel - RE: [PATCH V2 1/1] X86: Hyper-V: Get the local APIC timer frequency from the hypervisor

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Date:	Fri, 27 Sep 2013 15:35:00 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Olaf Hering <olaf@...fle.de>
CC:	"x86@...nel.org" <x86@...nel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>,
	"JBeulich@...e.com" <JBeulich@...e.com>,
	"bp@...en8.de" <bp@...en8.de>
Subject: RE: [PATCH V2 1/1] X86: Hyper-V: Get the local APIC timer frequency
 from the hypervisor



> -----Original Message-----
> From: Olaf Hering [mailto:olaf@...fle.de]
> Sent: Friday, September 27, 2013 8:33 AM
> To: KY Srinivasan
> Cc: x86@...nel.org; gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; apw@...onical.com; jasowang@...hat.com;
> tglx@...utronix.de; hpa@...or.com; JBeulich@...e.com; bp@...en8.de
> Subject: Re: [PATCH V2 1/1] X86: Hyper-V: Get the local APIC timer frequency
> from the hypervisor
> 
> On Fri, Sep 27, KY Srinivasan wrote:
> 
> > > This leads to build errors on 32bit:
> > >
> > > linux-3.12-rc2/arch/x86/kernel/cpu/mshyperv.c:88: undefined reference to
> > > `__udivdi3'
> > >
> > > Up to now I have only tested on 64bit, sorry for that.
> >
> > Thanks Olaf. I am travelling currently; I will fix it when I get back (early next
> week).
> 
> This change seems to fix it:
> 
> -+              hv_lapic_frequency /= HZ;
> ++              div_u64(hv_lapic_frequency, HZ);

Thanks Olaf. Could you submit the patch.

Regards,

K. Y