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.ga17...@light.dominikbrodowski.net Cc: Ingo Molnar <mi...@redhat.com> Cc: Peter Zijlstra <pet...@infradead.org> Signed-off-by: Dominik Brodowski <li...@dominikbrodowski.net> --- kernel/sched/core.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index e7c535eee0a6..8de4919c889a 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -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); -- 2.16.3
