Merge with /pub/scm/linux/kernel/git/torvalds/linux-2.6.git

1 files changed, 18 insertions, 6 deletions

diff --git a/arch/sparc64/kernel/process.c b/arch/sparc64/kernel/process.c
index 7d10b0397091..02f9dec1d459 100644
--- a/arch/sparc64/kernel/process.c
+++ b/arch/sparc64/kernel/process.c
@@ -74,7 +74,9 @@ void cpu_idle(void)
 		while (!need_resched())
 			barrier();
 
+		preempt_enable_no_resched();
 		schedule();
+		preempt_disable();
 		check_pgt_cache();
 	}
 }
@@ -83,21 +85,31 @@ void cpu_idle(void)
 
 /*
  * the idle loop on a UltraMultiPenguin...
+ *
+ * TIF_POLLING_NRFLAG is set because we do not sleep the cpu
+ * inside of the idler task, so an interrupt is not needed
+ * to get a clean fast response.
+ *
+ * XXX Reverify this assumption... -DaveM
+ *
+ * Addendum: We do want it to do something for the signal
+ *           delivery case, we detect that by just seeing
+ *           if we are trying to send this to an idler or not.
  */
-#define idle_me_harder()	(cpu_data(smp_processor_id()).idle_volume += 1)
-#define unidle_me()		(cpu_data(smp_processor_id()).idle_volume = 0)
 void cpu_idle(void)
 {
+	cpuinfo_sparc *cpuinfo = &local_cpu_data();
 	set_thread_flag(TIF_POLLING_NRFLAG);
+
 	while(1) {
 		if (need_resched()) {
-			unidle_me();
-			clear_thread_flag(TIF_POLLING_NRFLAG);
+			cpuinfo->idle_volume = 0;
+			preempt_enable_no_resched();
 			schedule();
-			set_thread_flag(TIF_POLLING_NRFLAG);
+			preempt_disable();
 			check_pgt_cache();
 		}
-		idle_me_harder();
+		cpuinfo->idle_volume++;
 
 		/* The store ordering is so that IRQ handlers on
 		 * other cpus see our increasing idleness for the buddy