[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 3d31636cbafb584d25995e6ae6ff9d253a95901d..6183aeccecf1f9d564cc2bc2832943a235ed3871 100644 (file)
--- 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