From: Tony Luck <tony.luck@intel.com>
Date: Thu, 15 Jan 2009 18:29:17 +0000 (-0800)
Subject: [IA64] Turn on CONFIG_HAVE_UNSTABLE_CLOCK
X-Git-Tag: v2.6.29-rc2~65^2~3
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=0773a6cf673316440999752e23f8c3d4f85e48b9;p=linux-2.6-omap-h63xx.git

[IA64] Turn on CONFIG_HAVE_UNSTABLE_CLOCK

sched_clock() on ia64 is based on ar.itc, so is never
completely synchronized between cpus. On some platforms
(e.g. certain models of SGI Altix) it may be running at
radically different frequencies.

Based on a patch from Dimitri Sivanich which set this
just for SN2 && GENERIC kernels ... it is needed for
all ia64 machines.

Signed-off-by: Tony Luck <tony.luck@intel.com>
---

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 3d31636cbaf..6183aeccecf 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -17,6 +17,7 @@ config IA64
 	select ACPI if (!IA64_HP_SIM)
 	select PM if (!IA64_HP_SIM)
 	select ARCH_SUPPORTS_MSI
+	select HAVE_UNSTABLE_SCHED_CLOCK
 	select HAVE_IDE
 	select HAVE_OPROFILE
 	select HAVE_KPROBES