sched: convert BALANCE_FOR_xx_POWER to inline functions

Impact: cleanup

BALANCE_FOR_MC_POWER and similar macros defined in sched.h are
not constants and have various condition checks and significant
amount of code that is not suitable to be contain in a macro.
Also there could be side effects on the expressions passed to
some of them like test_sd_parent().

This patch converts all complex macros related to power savings
balance to inline functions.

Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 26 insertions, 11 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4240f6bfa812..1210fb0e45ff 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -763,15 +763,23 @@ enum cpu_idle_type {
 #define SD_SERIALIZE            1024    /* Only a single load balancing instance */
 #define SD_WAKE_IDLE_FAR        2048    /* Gain latency sacrificing cache hit */
 
-#define BALANCE_FOR_MC_POWER    \
-        (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
+extern int sched_mc_power_savings, sched_smt_power_savings;
+
+static inline int sd_balance_for_mc_power(void)
+{
+        if (sched_smt_power_savings)
+                return SD_POWERSAVINGS_BALANCE;
 
-#define BALANCE_FOR_PKG_POWER   \
-        ((sched_mc_power_savings || sched_smt_power_savings) ?  \
-         SD_POWERSAVINGS_BALANCE : 0)
+        return 0;
+}
 
-#define test_sd_parent(sd, flag)        ((sd->parent &&         \
-                                         (sd->parent->flags & flag)) ? 1 : 0)
+static inline int sd_balance_for_package_power(void)
+{
+        if (sched_mc_power_savings | sched_smt_power_savings)
+                return SD_POWERSAVINGS_BALANCE;
+
+        return 0;
+}
 
 
 struct sched_group {
@@ -1399,6 +1407,15 @@ struct task_struct {
 #endif
 };
 
+/* Test a flag in parent sched domain */
+static inline int test_sd_parent(struct sched_domain *sd, int flag)
+{
+        if (sd->parent && (sd->parent->flags & flag))
+                return 1;
+
+        return 0;
+}
+
 /*
  * Priority of a process goes from 0..MAX_PRIO-1, valid RT
  * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
@@ -2256,8 +2273,6 @@ __trace_special(void *__tr, void *__data,
 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
 
-extern int sched_mc_power_savings, sched_smt_power_savings;
-
 extern void normalize_rt_tasks(void);
 
 #ifdef CONFIG_GROUP_SCHED
diff --git a/include/linux/topology.h b/include/linux/topology.h
index 0c5b5ac36d8e..0ce7c0dac06c 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -125,7 +125,7 @@ int arch_update_cpu_topology(void);
                                 | SD_WAKE_AFFINE        \
                                 | SD_WAKE_BALANCE       \
                                 | SD_SHARE_PKG_RESOURCES\
-                                | BALANCE_FOR_MC_POWER, \
+                                | sd_balance_for_mc_power(),\
         .last_balance           = jiffies,              \
         .balance_interval       = 1,                    \
 }
@@ -150,7 +150,7 @@ int arch_update_cpu_topology(void);
                                 | SD_BALANCE_FORK       \
                                 | SD_WAKE_AFFINE        \
                                 | SD_WAKE_BALANCE       \
-                                | BALANCE_FOR_PKG_POWER,\
+                                | sd_balance_for_package_power(),\
         .last_balance           = jiffies,              \
         .balance_interval       = 1,                    \
 }