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    SubjectApplied "spi: Reduce kthread priority" to the spi tree
    Date
    The patch

    spi: Reduce kthread priority

    has been applied to the spi tree at

    https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-5.4

    All being well this means that it will be integrated into the linux-next
    tree (usually sometime in the next 24 hours) and sent to Linus during
    the next merge window (or sooner if it is a bug fix), however if
    problems are discovered then the patch may be dropped or reverted.

    You may get further e-mails resulting from automated or manual testing
    and review of the tree, please engage with people reporting problems and
    send followup patches addressing any issues that are reported if needed.

    If any updates are required or you are submitting further changes they
    should be sent as incremental updates against current git, existing
    patches will not be replaced.

    Please add any relevant lists and maintainers to the CCs when replying
    to this mail.

    Thanks,
    Mark

    From 4ff13d00ebd5533947b083c66d44da3243a2d559 Mon Sep 17 00:00:00 2001
    From: Peter Zijlstra <peterz@infradead.org>
    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 <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>
    ---
    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");
    --
    2.20.1
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