linux-kernel - [RFC PATCH 1/3] sched: remove duplicate ifdefs

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Message-Id: <20240118080326.13137-2-sshegde@linux.ibm.com>
Date: Thu, 18 Jan 2024 13:33:24 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: linux-kernel@...r.kernel.org, linux-ntfs-dev@...ts.sourceforge.net,
        linux-xfs@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Cc: sshegde@...ux.ibm.com, mpe@...erman.id.au, mingo@...nel.org,
        peterz@...radead.org, chandan.babu@...cle.com, anton@...era.com
Subject: [RFC PATCH 1/3] sched: remove duplicate ifdefs

when a ifdef is used in the below manner, second one could be considered as
duplicate.

ifdef DEFINE_A
..code block...
ifdef DEFINE_A
..code block...
endif
..code block...
endif

In the scheduler code, there are two places where above pattern can be
observed. Hence second ifdef is a duplicate and not needed.
Plus a minor comment update to reflect the else case.

No functional change is intended here. It only aims to improve code
readability.

Signed-off-by: Shrikanth Hegde <sshegde@...ux.ibm.com>
---
 kernel/sched/core.c | 4 +---
 kernel/sched/fair.c | 2 --
 2 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 038eeaf76d2d..1bfb186fd67f 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1792,7 +1792,6 @@ static void cpu_util_update_eff(struct cgroup_subsys_state *css);
 #endif

 #ifdef CONFIG_SYSCTL
-#ifdef CONFIG_UCLAMP_TASK
 #ifdef CONFIG_UCLAMP_TASK_GROUP
 static void uclamp_update_root_tg(void)
 {
@@ -1898,7 +1897,6 @@ static int sysctl_sched_uclamp_handler(struct ctl_table *table, int write,
 	return result;
 }
 #endif
-#endif

 static int uclamp_validate(struct task_struct *p,
 			   const struct sched_attr *attr)
@@ -2065,7 +2063,7 @@ static void __init init_uclamp(void)
 	}
 }

-#else /* CONFIG_UCLAMP_TASK */
+#else /* !CONFIG_UCLAMP_TASK */
 static inline void uclamp_rq_inc(struct rq *rq, struct task_struct *p) { }
 static inline void uclamp_rq_dec(struct rq *rq, struct task_struct *p) { }
 static inline int uclamp_validate(struct task_struct *p,
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f2bb83675e4a..6158a6752c25 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -10166,10 +10166,8 @@ static int idle_cpu_without(int cpu, struct task_struct *p)
 	 * be computed and tested before calling idle_cpu_without().
 	 */

-#ifdef CONFIG_SMP
 	if (rq->ttwu_pending)
 		return 0;
-#endif

 	return 1;
 }
--
2.39.3