linux-kernel - Re: [patch] sched: improve sched

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Message-ID: <20061223102707.GA20251@elte.hu>
Date:	Sat, 23 Dec 2006 11:27:07 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Stephane Eranian <eranian@....hp.com>
Cc:	linux-kernel@...r.kernel.org, venkatesh.pallipadi@...el.com,
	suresh.b.siddha@...el.com, kenneth.w.chen@...el.com,
	tony.luck@...el.com, Andrew Morton <akpm@...l.org>
Subject: Re: [patch] sched: improve sched_clock() on i686


* Ingo Molnar <mingo@...e.hu> wrote:

> it's purely historic - the i686 sched_clock() implementation predates 
> the scheduler's ability to deal with non-synchronous per-CPU clocks. I 
> tried to fix that (a year ago) and it didnt work out - but i've 
> reviewed my old patch and now realize what the mistake was - the patch 
> below should work better.

that patch needs the small fix below as well.

	Ingo

Index: linux/include/asm-i386/bugs.h
===================================================================
--- linux.orig/include/asm-i386/bugs.h
+++ linux/include/asm-i386/bugs.h
@@ -160,7 +160,7 @@ static void __init check_config(void)
  * If we configured ourselves for a TSC, we'd better have one!
  */
 #ifdef CONFIG_X86_TSC
-	if (!cpu_has_tsc)
+	if (!cpu_has_tsc && !tsc_disable)
 		panic("Kernel compiled for Pentium+, requires TSC feature!");
 #endif
 

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