IA64: Turn on CONFIG_HAVE_UNSTABLE_CLOCK

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>

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 48e496fe1e753102811cb4064f4da6d8f0060c4f..fb7e69cb47f36160c94f0a405232c80ec2fbee6c 100644 (file)
--- 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