The following commit has been merged into the irq/irqchip-next branch of irqchip:
Commit-ID: 0b39498230ae53e6af981141be99f4c7d5144de6 Gitweb: https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/0b39498230ae53e6af981141be99f4c7d5144de6 Author: Shenming Lu <[email protected]> AuthorDate: Sat, 28 Nov 2020 22:18:56 +08:00 Committer: Marc Zyngier <[email protected]> CommitterDate: Fri, 11 Dec 2020 14:47:10 irqchip/gic-v4.1: Reduce the delay when polling GICR_VPENDBASER.Dirty The 10us delay of the poll on the GICR_VPENDBASER.Dirty bit is too high, which might greatly affect the total scheduling latency of a vCPU in our measurement. So we reduce it to 1 to lessen the impact. Signed-off-by: Shenming Lu <[email protected]> Signed-off-by: Marc Zyngier <[email protected]> Link: https://lore.kernel.org/r/[email protected] --- drivers/irqchip/irq-gic-v3-its.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 4069c21..d74ef41 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -3808,7 +3808,7 @@ static void its_wait_vpt_parse_complete(void) WARN_ON_ONCE(readq_relaxed_poll_timeout_atomic(vlpi_base + GICR_VPENDBASER, val, !(val & GICR_VPENDBASER_Dirty), - 10, 500)); + 1, 500)); } static void its_vpe_schedule(struct its_vpe *vpe)
