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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-14 22:40:35 +0100
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 20:15:31 +0200
commit7d4dd4f159b94003655b1688d9a4c0e2b6268ff8 (patch)
treeba86cee2e4ce224148661fcd8255416c136af374
parente530dca584a9aa4aedf26adf0ed3c1c9b80e2767 (diff)
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>
-rw-r--r--kernel/sched/core.c8
1 files 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);