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sched: add do_sched_yield() helper; remove in-kernel call to sched_yield() 

Using the sched-internal do_sched_yield() helper allows us to get rid of
the sched-internal call to the sys_sched_yield() syscall.

This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net

Cc: Ingo Molnar <mingo@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
hifive-unleashed-5.1
Dominik Brodowski 2018-03-14 22:40:35 +01:00
parent e530dca584
commit 7d4dd4f159
1 changed files with 6 additions and 2 deletions
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8
kernel/sched/core.c
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@ -4892,7 +4892,7 @@ SYSCALL_DEFINE3(sched_getaffinity, pid_t, pid, unsigned int, len,
*
* Return: 0.
*/
SYSCALL_DEFINE0(sched_yield)
static void do_sched_yield(void)
{
struct rq_flags rf;
struct rq *rq;
@ -4913,7 +4913,11 @@ SYSCALL_DEFINE0(sched_yield)
sched_preempt_enable_no_resched();
schedule();
}
SYSCALL_DEFINE0(sched_yield)
{
do_sched_yield();
return 0;
}
@ -4997,7 +5001,7 @@ EXPORT_SYMBOL(__cond_resched_softirq);
void __sched yield(void)
{
set_current_state(TASK_RUNNING);
sys_sched_yield();
do_sched_yield();
}
EXPORT_SYMBOL(yield);