Unverified Commit 4ff13d00 authored Aug 01, 2019 by Peter Zijlstra Committed by Mark Brown Aug 02, 2019

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 <bleung@chromium.org>
Cc: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Cc: Guenter Roeck <groeck@chromium.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: linux-spi@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20190801111541.917256884@infradead.org

Signed-off-by: Mark Brown <broonie@kernel.org>

parent cc8b4659

drivers/platform/chrome/cros_ec_spi.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;

drivers/spi/spi.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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");

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