linux-kernel - [PATCH V6 4/7] pseries/cpuidle: Remove MAX_IDLE

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Message-ID: <20130827183126.18579.80649.stgit@deepthi.in.ibm.com>
Date:	Wed, 28 Aug 2013 00:01:28 +0530
From:	Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>
To:	linux-pm@...ts.linux-foundation.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Cc:	b.zolnierkie@...sung.com, benh@...nel.crashing.org,
	daniel.lezcano@...aro.org, dongsheng.wang@...escale.com,
	michael@...erman.id.au, scottwood@...escale.com,
	srivatsa.bhat@...ux.vnet.ibm.com, preeti@...ux.vnet.ibm.com,
	svaidy@...ux.vnet.ibm.com
Subject: [PATCH V6 4/7] pseries/cpuidle: Remove MAX_IDLE_STATE macro.

This patch removes the usage of MAX_IDLE_STATE macro
and dead code around it. The number of states
are determined at run time based on the cpuidle
state table selected on a given platform

Signed-off-by: Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>
---
 drivers/cpuidle/cpuidle-ibm-power.c |   26 +++++++++-----------------
 1 file changed, 9 insertions(+), 17 deletions(-)

diff --git a/drivers/cpuidle/cpuidle-ibm-power.c b/drivers/cpuidle/cpuidle-ibm-power.c
index 262db3c..14ebdb4 100644
--- a/drivers/cpuidle/cpuidle-ibm-power.c
+++ b/drivers/cpuidle/cpuidle-ibm-power.c
@@ -25,9 +25,7 @@ struct cpuidle_driver pseries_idle_driver = {
 	.owner            = THIS_MODULE,
 };
 
-#define MAX_IDLE_STATE_COUNT	2
-
-static int max_idle_state = MAX_IDLE_STATE_COUNT - 1;
+static int max_idle_state;
 static struct cpuidle_state *cpuidle_state_table;
 
 static inline void idle_loop_prolog(unsigned long *in_purr)
@@ -133,7 +131,7 @@ static int shared_cede_loop(struct cpuidle_device *dev,
 /*
  * States for dedicated partition case.
  */
-static struct cpuidle_state dedicated_states[MAX_IDLE_STATE_COUNT] = {
+static struct cpuidle_state dedicated_states[] = {
 	{ /* Snooze */
 		.name = "snooze",
 		.desc = "snooze",
@@ -153,7 +151,7 @@ static struct cpuidle_state dedicated_states[MAX_IDLE_STATE_COUNT] = {
 /*
  * States for shared partition case.
  */
-static struct cpuidle_state shared_states[MAX_IDLE_STATE_COUNT] = {
+static struct cpuidle_state shared_states[] = {
 	{ /* Shared Cede */
 		.name = "Shared Cede",
 		.desc = "Shared Cede",
@@ -223,11 +221,7 @@ static int pseries_cpuidle_driver_init(void)
 	struct cpuidle_driver *drv = &pseries_idle_driver;
 
 	drv->state_count = 0;
-
-	for (idle_state = 0; idle_state < MAX_IDLE_STATE_COUNT; ++idle_state) {
-
-		if (idle_state > max_idle_state)
-			break;
+	for (idle_state = 0; idle_state < max_idle_state; ++idle_state) {
 
 		/* is the state not enabled? */
 		if (cpuidle_state_table[idle_state].enter == NULL)
@@ -252,16 +246,14 @@ static int pseries_idle_probe(void)
 	if (cpuidle_disable != IDLE_NO_OVERRIDE)
 		return -ENODEV;
 
-	if (max_idle_state == 0) {
-		printk(KERN_DEBUG "pseries processor idle disabled.\n");
-		return -EPERM;
-	}
-
 	if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
-		if (get_lppaca()->shared_proc)
+		if (get_lppaca()->shared_proc) {
 			cpuidle_state_table = shared_states;
-		else
+			max_idle_state = ARRAY_SIZE(shared_states);
+		} else {
 			cpuidle_state_table = dedicated_states;
+			max_idle_state = ARRAY_SIZE(dedicated_states);
+		}
 	} else
 		return -ENODEV;
 

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