Re: 2.6.14-rc2-mm1

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On Sun, 25 Sep 2005, Paul Blazejowski wrote:

> Upon quick testing the latest mm kernel it appears there's some kind of
> race condition when using dual core cpu esp when using XORG and USB
> (although PS2 has same issue) kebyboard rate being too fast.

Does the following patch by John Stultz fix the problem?

Tim


>From [email protected] Mon Sep 26 09:04:08 2005
Date: Mon, 19 Sep 2005 12:16:43 -0700
From: john stultz <[email protected]>
To: Andrew Morton <[email protected]>
Cc: lkml <[email protected]>, Andi Kleen <[email protected]>
Subject: [PATCH] x86-64: Fix bad assumption that dualcore cpus have synced
    TSCs

Andrew,
	This patch should resolve the issue seen in bugme bug #5105, where it
is assumed that dualcore x86_64 systems have synced TSCs. This is not
the case, and alternate timesources should be used instead.

For more details, see:
http://bugzilla.kernel.org/show_bug.cgi?id=5105


Please consider for inclusion in your tree.

thanks
-john

diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c
--- a/arch/x86_64/kernel/time.c
+++ b/arch/x86_64/kernel/time.c
@@ -959,9 +959,6 @@ static __init int unsynchronized_tsc(voi
  	   are handled in the OEM check above. */
  	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
  		return 0;
- 	/* All in a single socket - should be synchronized */
- 	if (cpus_weight(cpu_core_map[0]) == num_online_cpus())
- 		return 0;
 #endif
  	/* Assume multi socket systems are not synchronized */
  	return num_online_cpus() > 1;


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