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SubjectRe: 2.6.14-rc2-mm1
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?


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

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:

Please consider for inclusion in your tree.


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;
/* Assume multi socket systems are not synchronized */
return num_online_cpus() > 1;

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