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[IA64] Turn on CONFIG_HAVE_UNSTABLE_CLOCK

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From: Linux Kernel Mailing List
Subject: [IA64] Turn on CONFIG_HAVE_UNSTABLE_CLOCK
Date: Thursday, January 15, 2009 - 7:00 pm

Gitweb:     http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0773a6...
Commit:     0773a6cf673316440999752e23f8c3d4f85e48b9
Parent:     7a0b6e01434f77194b86c8051b4c3718da636c64
Author:     Tony Luck <tony.luck@intel.com>
AuthorDate: Thu Jan 15 10:29:17 2009 -0800
Committer:  Tony Luck <tony.luck@intel.com>
CommitDate: Thu Jan 15 10:29:17 2009 -0800

    [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>
---
 arch/ia64/Kconfig |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 3d31636..6183aec 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
--
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[IA64] Turn on CONFIG_HAVE_UNSTABLE_CLOCK, Linux Kernel Mailing ..., (Thu Jan 15, 7:00 pm)