[PATCH] Fix idle notifiers

Previously exit_idle would be called more often than enter_idle

Now instead of using complicated tests just keep track of it
using the per CPU variable as a flip flop.  I moved the idle state into the
PDA to make the access more efficient.

Original bug report and an initial patch from Stephane Eranian,
but redone by AK.

Cc: Stephane Eranian <eranian@hpl.hp.com>

Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/asm-x86_64/pda.h b/include/asm-x86_64/pda.h
index 531f48a6c3af..14996d962bac 100644
--- a/include/asm-x86_64/pda.h
+++ b/include/asm-x86_64/pda.h
@@ -25,7 +25,8 @@ struct x8664_pda {
         int nodenumber;             /* number of current node */
         unsigned int __softirq_pending;
         unsigned int __nmi_count;       /* number of NMI on this CPUs */
-        int mmu_state;     
+        short mmu_state;
+        short isidle;
         struct mm_struct *active_mm;
         unsigned apic_timer_irqs;
 } ____cacheline_aligned_in_smp;