From 4ff13d00ebd5533947b083c66d44da3243a2d559 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Thu, 1 Aug 2019 13:13:53 +0200 Subject: [PATCH] spi: Reduce kthread priority The SPI thingies request FIFO-99 by default, reduce this to FIFO-50. FIFO-99 is the very highest priority available to SCHED_FIFO and it not a suitable default; it would indicate the SPI work is the most important work on the machine. Cc: Benson Leung Cc: Enric Balletbo i Serra Cc: Guenter Roeck Cc: Mark Brown Cc: linux-spi@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Douglas Anderson Link: https://lore.kernel.org/r/20190801111541.917256884@infradead.org Signed-off-by: Mark Brown --- drivers/platform/chrome/cros_ec_spi.c | 2 +- drivers/spi/spi.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/platform/chrome/cros_ec_spi.c b/drivers/platform/chrome/cros_ec_spi.c index 006a8ff64057..714306bc3f79 100644 --- a/drivers/platform/chrome/cros_ec_spi.c +++ b/drivers/platform/chrome/cros_ec_spi.c @@ -706,7 +706,7 @@ static int cros_ec_spi_devm_high_pri_alloc(struct device *dev, struct cros_ec_spi *ec_spi) { struct sched_param sched_priority = { - .sched_priority = MAX_RT_PRIO - 1, + .sched_priority = MAX_RT_PRIO / 2, }; int err; diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 9fd7926e80c0..8e83c9567353 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1434,7 +1434,7 @@ static void spi_pump_messages(struct kthread_work *work) */ static void spi_set_thread_rt(struct spi_controller *ctlr) { - struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 }; + struct sched_param param = { .sched_priority = MAX_RT_PRIO / 2 }; dev_info(&ctlr->dev, "will run message pump with realtime priority\n"); -- 2.11.0