Commit a87e749e authored by Steven Rostedt (VMware)'s avatar Steven Rostedt (VMware) Committed by Peter Zijlstra
Browse files

sched: Remove struct sched_class::next field 



Now that the sched_class descriptors are defined in order via the linker
script vmlinux.lds.h, there's no reason to have a "next" pointer to the
previous priroity structure. The order of the sturctures can be aligned as
an array, and used to index and find the next sched_class descriptor.

Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20191219214558.845353593@goodmis.org
parent c3a340f7

kernel/sched/deadline.c

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Original line number Diff line number Diff line
@@ -2481,7 +2481,6 @@ static void prio_changed_dl(struct rq *rq, struct task_struct *p, 


const struct sched_class dl_sched_class

	__attribute__((section("__dl_sched_class"))) = {

	.next			= &rt_sched_class,

	.enqueue_task		= enqueue_task_dl,

	.dequeue_task		= dequeue_task_dl,

	.yield_task		= yield_task_dl,

kernel/sched/fair.c

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@@ -11124,7 +11124,6 @@ static unsigned int get_rr_interval_fair(struct rq *rq, struct task_struct *task 
 */

const struct sched_class fair_sched_class

	__attribute__((section("__fair_sched_class"))) = {

	.next			= &idle_sched_class,

	.enqueue_task		= enqueue_task_fair,

	.dequeue_task		= dequeue_task_fair,

	.yield_task		= yield_task_fair,

kernel/sched/idle.c

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@@ -455,7 +455,6 @@ static void update_curr_idle(struct rq *rq) 
 */

const struct sched_class idle_sched_class

	__attribute__((section("__idle_sched_class"))) = {

	/* .next is NULL */

	/* no enqueue/yield_task for idle tasks */



	/* dequeue is not valid, we print a debug message there: */

kernel/sched/rt.c

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@@ -2431,7 +2431,6 @@ static unsigned int get_rr_interval_rt(struct rq *rq, struct task_struct *task) 


const struct sched_class rt_sched_class

	__attribute__((section("__rt_sched_class"))) = {

	.next			= &fair_sched_class,

	.enqueue_task		= enqueue_task_rt,

	.dequeue_task		= dequeue_task_rt,

	.yield_task		= yield_task_rt,

kernel/sched/sched.h

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@@ -1754,7 +1754,6 @@ extern const u32 sched_prio_to_wmult[40]; 
#define RETRY_TASK		((void *)-1UL)



struct sched_class {

	const struct sched_class *next;



#ifdef CONFIG_UCLAMP_TASK

	int uclamp_enabled;

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