linux-kernel - [PATCH v1 5/6] pseries/cpuidle: Remove MAX_IDLE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20140114105624.3064.76270.stgit@deepthi.in.ibm.com>
Date:	Tue, 14 Jan 2014 16:26:28 +0530
From:	Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>
To:	linux-pm@...r.kernel.org, benh@...nel.crashing.org,
	daniel.lezcano@...aro.org, linux-kernel@...r.kernel.org,
	srivatsa.bhat@...ux.vnet.ibm.com, preeti@...ux.vnet.ibm.com,
	svaidy@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v1 5/6] 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-pseries.c |   28 ++++++++++------------------
 1 file changed, 10 insertions(+), 18 deletions(-)

diff --git a/drivers/cpuidle/cpuidle-pseries.c b/drivers/cpuidle/cpuidle-pseries.c
index 5e13f6c..bb56091 100644
--- a/drivers/cpuidle/cpuidle-pseries.c
+++ b/drivers/cpuidle/cpuidle-pseries.c
@@ -24,9 +24,7 @@ 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)
@@ -134,7 +132,7 @@ 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",
@@ -154,7 +152,7 @@ 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",
@@ -225,12 +223,8 @@ static int pseries_cpuidle_driver_init(void)
 
 	drv->state_count = 0;
 
-	for (idle_state = 0; idle_state < MAX_IDLE_STATE_COUNT; ++idle_state) {
-
-		if (idle_state > max_idle_state)
-			break;
-
-		/* is the state not enabled? */
+	for (idle_state = 0; idle_state < max_idle_state; ++idle_state) {
+		/* Is the state not enabled? */
 		if (cpuidle_state_table[idle_state].enter == NULL)
 			continue;
 
@@ -253,16 +247,14 @@ 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 (lppaca_shared_proc(get_lppaca()))
+		if (lppaca_shared_proc(get_lppaca())) {
 			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;
 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/