[PATCH 02/23] sched,bL_switcher: Convert to sched_set_fifo*()

From: Peter Zijlstra
Date: Wed Apr 22 2020 - 07:32:19 EST


Because SCHED_FIFO is a broken scheduler model (see previous patches)
take away the priority field, the kernel can't possibly make an
informed decision.

In this case, use fifo_low, because it only cares about being above
SCHED_NORMAL. Effectively no change in behaviour.

Cc: nico@xxxxxxxxxxx
Cc: rmk+kernel@xxxxxxxxxxxxxxxx
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/arm/common/bL_switcher.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/arch/arm/common/bL_switcher.c
+++ b/arch/arm/common/bL_switcher.c
@@ -270,12 +270,11 @@ static struct bL_thread bL_threads[NR_CP
static int bL_switcher_thread(void *arg)
{
struct bL_thread *t = arg;
- struct sched_param param = { .sched_priority = 1 };
int cluster;
bL_switch_completion_handler completer;
void *completer_cookie;

- sched_setscheduler_nocheck(current, SCHED_FIFO, &param);
+ sched_set_fifo_low(current);
complete(&t->started);

do {