[PATCH 09/23] sched,ivtv: Convert to sched_set_fifo*()

From: Peter Zijlstra
Date: Wed Apr 22 2020 - 07:30:21 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.

Effectively changes from 99 to 50.

Cc: hverkuil@xxxxxxxxx
Cc: awalls@xxxxxxxxxxxxxxxx
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
drivers/media/pci/ivtv/ivtv-driver.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/media/pci/ivtv/ivtv-driver.c
+++ b/drivers/media/pci/ivtv/ivtv-driver.c
@@ -737,8 +737,6 @@ static void ivtv_process_options(struct
*/
static int ivtv_init_struct1(struct ivtv *itv)
{
- struct sched_param param = { .sched_priority = 99 };
-
itv->base_addr = pci_resource_start(itv->pdev, 0);
itv->enc_mbox.max_mbox = 2; /* the encoder has 3 mailboxes (0-2) */
itv->dec_mbox.max_mbox = 1; /* the decoder has 2 mailboxes (0-1) */
@@ -758,7 +756,7 @@ static int ivtv_init_struct1(struct ivtv
return -1;
}
/* must use the FIFO scheduler as it is realtime sensitive */
- sched_setscheduler(itv->irq_worker_task, SCHED_FIFO, &param);
+ sched_set_fifo(itv->irq_worker_task);

kthread_init_work(&itv->irq_work, ivtv_irq_work_handler);