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Revert "BACKPORT:sched: Provide sched_set_fifo()"

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This reverts commit 250751cadf.

Reason for revert: Conflicts with upstream commits.

Change-Id: I3eac9acf461e6492ccae2870afebf03db3889632
This commit is contained in:
Michael Bestas 2025-03-19 07:30:33 +02:00
commit 6e34d77850
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2 changed files with 0 additions and 48 deletions
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3
include/linux/sched.h
View file

@ -1814,9 +1814,6 @@ extern int idle_cpu(int cpu);
extern int available_idle_cpu(int cpu);
extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *);
extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *);
extern void sched_set_fifo(struct task_struct *p);
extern void sched_set_fifo_low(struct task_struct *p);
extern void sched_set_normal(struct task_struct *p, int nice);
extern int sched_setattr(struct task_struct *, const struct sched_attr *);
extern int sched_setattr_nocheck(struct task_struct *, const struct sched_attr *);
extern struct task_struct *idle_task(int cpu);

45
kernel/sched/core.c
View file

@ -5380,51 +5380,6 @@ int sched_setscheduler_nocheck(struct task_struct *p, int policy,
}
EXPORT_SYMBOL_GPL(sched_setscheduler_nocheck);
/*
* SCHED_FIFO is a broken scheduler model; that is, it is fundamentally
* incapable of resource management, which is the one thing an OS really should
* be doing.
*
* This is of course the reason it is limited to privileged users only.
*
* Worse still; it is fundamentally impossible to compose static priority
* workloads. You cannot take two correctly working static prio workloads
* and smash them together and still expect them to work.
*
* For this reason 'all' FIFO tasks the kernel creates are basically at:
*
* MAX_RT_PRIO / 2
*
* The administrator _MUST_ configure the system, the kernel simply doesn't
* know enough information to make a sensible choice.
*/
void sched_set_fifo(struct task_struct *p)
{
struct sched_param sp = { .sched_priority = MAX_RT_PRIO / 2 };
WARN_ON_ONCE(sched_setscheduler_nocheck(p, SCHED_FIFO, &sp) != 0);
}
EXPORT_SYMBOL_GPL(sched_set_fifo);
/*
* For when you don't much care about FIFO, but want to be above SCHED_NORMAL.
*/
void sched_set_fifo_low(struct task_struct *p)
{
struct sched_param sp = { .sched_priority = 1 };
WARN_ON_ONCE(sched_setscheduler_nocheck(p, SCHED_FIFO, &sp) != 0);
}
EXPORT_SYMBOL_GPL(sched_set_fifo_low);
void sched_set_normal(struct task_struct *p, int nice)
{
struct sched_attr attr = {
.sched_policy = SCHED_NORMAL,
.sched_nice = nice,
};
WARN_ON_ONCE(sched_setattr_nocheck(p, &attr) != 0);
}
EXPORT_SYMBOL_GPL(sched_set_normal);
static int
do_sched_setscheduler(pid_t pid, int policy, struct sched_param __user *param)
{