[PATCH] sched: resched and cpu_idle rework

[karo-tx-linux.git] / arch / sparc64 / kernel / process.c

diff --git a/arch/sparc64/kernel/process.c b/arch/sparc64/kernel/process.c
index 2f89206e008f86e7f1b53f665d115e31cc194fd2..02f9dec1d459d79731a8d32658db102940cce2cc 100644 (file)
--- a/arch/sparc64/kernel/process.c
+++ b/arch/sparc64/kernel/process.c
@@ -85,23 +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();
                        preempt_disable();
-                       set_thread_flag(TIF_POLLING_NRFLAG);
                        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