[PATCH] ppc64: Move pSeries idle functions into pSeries_setup.c

dedicated_idle() and shared_idle() are only used by pSeries, so move them into
pSeries_setup.c
Signed-off-by: NMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: NAnton Blanchard <anton@samba.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

arch/ppc64/kernel/idle.c

@@ -74,137 +74,6 @@ int default_idle(void)
 	return 0;
 }
 
-#ifdef CONFIG_PPC_PSERIES
-
-DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
-
-int dedicated_idle(void)
-{
-	long oldval;
-	struct paca_struct *lpaca = get_paca(), *ppaca;
-	unsigned long start_snooze;
-	unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
-	unsigned int cpu = smp_processor_id();
-
-	ppaca = &paca[cpu ^ 1];
-
-	while (1) {
-		/*
-		 * Indicate to the HV that we are idle. Now would be
-		 * a good time to find other work to dispatch.
-		 */
-		lpaca->lppaca.idle = 1;
-
-		oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
-		if (!oldval) {
-			set_thread_flag(TIF_POLLING_NRFLAG);
-			start_snooze = __get_tb() +
-				*smt_snooze_delay * tb_ticks_per_usec;
-			while (!need_resched() && !cpu_is_offline(cpu)) {
-				/*
-				 * Go into low thread priority and possibly
-				 * low power mode.
-				 */
-				HMT_low();
-				HMT_very_low();
-
-				if (*smt_snooze_delay == 0 ||
-				    __get_tb() < start_snooze)
-					continue;
-
-				HMT_medium();
-
-				if (!(ppaca->lppaca.idle)) {
-					local_irq_disable();
-
-					/*
-					 * We are about to sleep the thread
-					 * and so wont be polling any
-					 * more.
-					 */
-					clear_thread_flag(TIF_POLLING_NRFLAG);
-
-					/*
-					 * SMT dynamic mode. Cede will result
-					 * in this thread going dormant, if the
-					 * partner thread is still doing work.
-					 * Thread wakes up if partner goes idle,
-					 * an interrupt is presented, or a prod
-					 * occurs.  Returning from the cede
-					 * enables external interrupts.
-					 */
-					if (!need_resched())
-						cede_processor();
-					else
-						local_irq_enable();
-				} else {
-					/*
-					 * Give the HV an opportunity at the
-					 * processor, since we are not doing
-					 * any work.
-					 */
-					poll_pending();
-				}
-			}
-
-			clear_thread_flag(TIF_POLLING_NRFLAG);
-		} else {
-			set_need_resched();
-		}
-
-		HMT_medium();
-		lpaca->lppaca.idle = 0;
-		schedule();
-		if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
-			cpu_die();
-	}
-	return 0;
-}
-
-static int shared_idle(void)
-{
-	struct paca_struct *lpaca = get_paca();
-	unsigned int cpu = smp_processor_id();
-
-	while (1) {
-		/*
-		 * Indicate to the HV that we are idle. Now would be
-		 * a good time to find other work to dispatch.
-		 */
-		lpaca->lppaca.idle = 1;
-
-		while (!need_resched() && !cpu_is_offline(cpu)) {
-			local_irq_disable();
-
-			/*
-			 * Yield the processor to the hypervisor.  We return if
-			 * an external interrupt occurs (which are driven prior
-			 * to returning here) or if a prod occurs from another 
-			 * processor. When returning here, external interrupts
-			 * are enabled.
-			 *
-			 * Check need_resched() again with interrupts disabled
-			 * to avoid a race.
-			 */
-			if (!need_resched())
-				cede_processor();
-			else
-				local_irq_enable();
-		}
-
-		HMT_medium();
-		lpaca->lppaca.idle = 0;
-		schedule();
-		if (cpu_is_offline(smp_processor_id()) &&
-		    system_state == SYSTEM_RUNNING)
-			cpu_die();
-	}
-
-	return 0;
-}
-
-#endif /* CONFIG_PPC_PSERIES */
-
 int native_idle(void)
 {
 	while(1) {

arch/ppc64/kernel/pSeries_setup.c

@@ -418,6 +418,133 @@ static int __init pSeries_probe(int platform)
 	return 1;
 }
 
+DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
+
+int dedicated_idle(void)
+{
+	long oldval;
+	struct paca_struct *lpaca = get_paca(), *ppaca;
+	unsigned long start_snooze;
+	unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
+	unsigned int cpu = smp_processor_id();
+
+	ppaca = &paca[cpu ^ 1];
+
+	while (1) {
+		/*
+		 * Indicate to the HV that we are idle. Now would be
+		 * a good time to find other work to dispatch.
+		 */
+		lpaca->lppaca.idle = 1;
+
+		oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
+		if (!oldval) {
+			set_thread_flag(TIF_POLLING_NRFLAG);
+			start_snooze = __get_tb() +
+				*smt_snooze_delay * tb_ticks_per_usec;
+			while (!need_resched() && !cpu_is_offline(cpu)) {
+				/*
+				 * Go into low thread priority and possibly
+				 * low power mode.
+				 */
+				HMT_low();
+				HMT_very_low();
+
+				if (*smt_snooze_delay == 0 ||
+				    __get_tb() < start_snooze)
+					continue;
+
+				HMT_medium();
+
+				if (!(ppaca->lppaca.idle)) {
+					local_irq_disable();
+
+					/*
+					 * We are about to sleep the thread
+					 * and so wont be polling any
+					 * more.
+					 */
+					clear_thread_flag(TIF_POLLING_NRFLAG);
+
+					/*
+					 * SMT dynamic mode. Cede will result
+					 * in this thread going dormant, if the
+					 * partner thread is still doing work.
+					 * Thread wakes up if partner goes idle,
+					 * an interrupt is presented, or a prod
+					 * occurs.  Returning from the cede
+					 * enables external interrupts.
+					 */
+					if (!need_resched())
+						cede_processor();
+					else
+						local_irq_enable();
+				} else {
+					/*
+					 * Give the HV an opportunity at the
+					 * processor, since we are not doing
+					 * any work.
+					 */
+					poll_pending();
+				}
+			}
+
+			clear_thread_flag(TIF_POLLING_NRFLAG);
+		} else {
+			set_need_resched();
+		}
+
+		HMT_medium();
+		lpaca->lppaca.idle = 0;
+		schedule();
+		if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
+			cpu_die();
+	}
+	return 0;
+}
+
+static int shared_idle(void)
+{
+	struct paca_struct *lpaca = get_paca();
+	unsigned int cpu = smp_processor_id();
+
+	while (1) {
+		/*
+		 * Indicate to the HV that we are idle. Now would be
+		 * a good time to find other work to dispatch.
+		 */
+		lpaca->lppaca.idle = 1;
+
+		while (!need_resched() && !cpu_is_offline(cpu)) {
+			local_irq_disable();
+
+			/*
+			 * Yield the processor to the hypervisor.  We return if
+			 * an external interrupt occurs (which are driven prior
+			 * to returning here) or if a prod occurs from another
+			 * processor. When returning here, external interrupts
+			 * are enabled.
+			 *
+			 * Check need_resched() again with interrupts disabled
+			 * to avoid a race.
+			 */
+			if (!need_resched())
+				cede_processor();
+			else
+				local_irq_enable();
+		}
+
+		HMT_medium();
+		lpaca->lppaca.idle = 0;
+		schedule();
+		if (cpu_is_offline(smp_processor_id()) &&
+		    system_state == SYSTEM_RUNNING)
+			cpu_die();
+	}
+
+	return 0;
+}
+
 struct machdep_calls __initdata pSeries_md = {
 	.probe			= pSeries_probe,
 	.setup_arch		= pSeries_setup_arch,