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Date: Fri, 19 Apr 2019 22:52:01 +0200 (CEST) From: Thomas Gleixner <tglx@...utronix.de> To: Jacob Pan <jacob.jun.pan@...ux.intel.com> cc: Daniel Drake <drake@...lessm.com>, Len Brown <lenb@...nel.org>, x86@...nel.org, LKML <linux-kernel@...r.kernel.org>, linux@...lessm.com, rjw@...ysocki.net, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com> Subject: Re: Detecting x86 LAPIC timer frequency from CPUID data On Fri, 19 Apr 2019, Jacob Pan wrote: > On Fri, 19 Apr 2019 10:57:10 +0200 (CEST) > Thomas Gleixner <tglx@...utronix.de> wrote: > > On Fri, 19 Apr 2019, Daniel Drake wrote: > > > 0x7FFFFF vs 0x7FFFFFFF, is that intentional? > > > > I don't think so. Looks like a failed copy and paste. Cc'ed Jacob, he > > might know. > > > At the time of v2.6.35 both places use 0x7FFFFF. But later this patch > increased the latter to 0x7FFFFFFF but forgot the first part. So I > guess it is not exactly a failed copy and paste. > > commit 4aed89d6b515b9185351706ca95cd712c9d8d6a3 > Author: Pierre Tardy <pierre.tardy@...el.com> > Date: Thu Jan 6 16:23:29 2011 +0100 > > x86, lapic-timer: Increase the max_delta to 31 bits Indeed. Thanks for digging that up! tglx
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