On Thu, Mar 29, 2018 at 01:23:20PM +0200, Dominik Brodowski wrote: > 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@xxxxxxxxxxxxxxxxxxxxxxxxxx > > Cc: Ingo Molnar <mingo@xxxxxxxxxx> Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> > Signed-off-by: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx> > --- > 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 >
