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From: Greg KH on 12 Mar 2010 19:30
2.6.33-stable review patch. If anyone has any objections, please let me know.

-----------------

From: Vaidyanathan Srinivasan <svaidy(a)linux.vnet.ibm.com>

commit 28f5318167adf23b16c844b9c2253f355cb21796 upstream.

Fix for sched_mc_powersavigs for pre-Nehalem platforms.
Child sched domain should clear SD_PREFER_SIBLING if parent will have
SD_POWERSAVINGS_BALANCE because they are contradicting.

Sets the flags correctly based on sched_mc_power_savings.

Signed-off-by: Vaidyanathan Srinivasan <svaidy(a)linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra(a)chello.nl>
LKML-Reference: <20100208100555.GD2931(a)dirshya.in.ibm.com>
Signed-off-by: Thomas Gleixner <tglx(a)linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
include/linux/sched.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -878,7 +878,10 @@ static inline int sd_balance_for_mc_powe
if (sched_smt_power_savings)
return SD_POWERSAVINGS_BALANCE;

- return SD_PREFER_SIBLING;
+ if (!sched_mc_power_savings)
+ return SD_PREFER_SIBLING;
+
+ return 0;
}

static inline int sd_balance_for_package_power(void)


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