Messages in this thread Patch in this message | | | Date | Thu, 22 Jan 2009 22:13:41 -0800 | From | Greg KH <> | Subject | [patch 14/40] IA64: Turn on CONFIG_HAVE_UNSTABLE_CLOCK |
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2.6.27-stable review patch. If anyone has any objections, please let us know.
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From: Tony Luck <tony.luck@intel.com>
commit 0773a6cf673316440999752e23f8c3d4f85e48b9 upstream.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- arch/ia64/Kconfig | 1 + 1 file changed, 1 insertion(+)
--- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -15,6 +15,7 @@ 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
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