From c6e2ccb66d0c3b4fffc59932585e9f709ad59003 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Tue, 26 Jun 2018 11:21:11 +0100 Subject: [PATCH] irqchip/gic-v3-its: Use pre-programmed redistributor tables with kdump kernels If using a kdump kernel, and that we cannot disable LPIs to install our own tables, let's switch to using the already allocated tables. This means that we'll change some of the initial kernel's memory, but at least we'll be able to have LPIs in this secondary kernel. Tested-by: Jeremy Linton Tested-by: Bhupesh Sharma Tested-by: Lei Zhang Signed-off-by: Marc Zyngier --- drivers/irqchip/irq-gic-v3-its.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 6a906641..83d5573 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -1963,8 +1964,15 @@ static void its_free_pending_table(struct page *pt) free_pages((unsigned long)page_address(pt), get_order(LPI_PENDBASE_SZ)); } +/* + * Booting with kdump and LPIs enabled is generally fine. + */ static bool enabled_lpis_allowed(void) { + /* Allow a kdump kernel */ + if (is_kdump_kernel()) + return true; + return false; } -- 2.7.4