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[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>
This commit is contained in:
Tony Luck 2009-01-15 10:29:17 -08:00
parent 7a0b6e0143
commit 0773a6cf67
1 changed files with 1 additions and 0 deletions
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arch/ia64/Kconfig
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@ -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