svn commit: r297374 - head/sys/x86/x86

[Pokala, Ravi]

Hi Kib,



-----Original Message-----
From: <owner-src-committers at freebsd.org> on behalf of Konstantin Belousov <kib at FreeBSD.org>
Date: 2016-03-29, Tuesday at 01:44
To: <src-committers at freebsd.org>, <svn-src-all at freebsd.org>, <svn-src-head at freebsd.org>
Subject: svn commit: r297374 - head/sys/x86/x86

>Author: kib
>Date: Tue Mar 29 08:44:56 2016
>New Revision: 297374
>URL: https://svnweb.freebsd.org/changeset/base/297374
>
>...
>  
>+	KASSERT((cpu_feature & CPUID_TSC) != 0 && tsc_freq != 0,
>+	    ("TSC not initialized"));
>+	r = rdtsc();
>+	for (r = 0; r < LOOPS; r++) {
>+		(void)lapic_read_icr_lo();
>+		ia32_pause();
>+	}
>+	r = rdtsc() - r;
>
>...

Doesn't use of r as the loop index overwrite the initial value returned by rdtsc()?

-Ravi