From 9a9dbab691be99f95f4dc2db698ba6f652f7e30b Mon Sep 17 00:00:00 2001 From: Tony Luck Date: Thu, 15 Jan 2009 10:29:17 -0800 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- arch/ia64/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig index 6bd91ed7cd03..0429d3e175c2 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 -- 2.39.5