This is a note to let you know that I've just added the patch titled
irqchip/gic: Allow self-SGIs for SMP on UP configurations
to the 4.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
irqchip-gic-allow-self-sgis-for-smp-on-up-configurations.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 059e232089e45b0befc9933d31209c225e08b426 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <marc.zyngier@xxxxxxx>
Date: Tue, 9 Aug 2016 07:50:44 +0100
Subject: irqchip/gic: Allow self-SGIs for SMP on UP configurations
From: Marc Zyngier <marc.zyngier@xxxxxxx>
commit 059e232089e45b0befc9933d31209c225e08b426 upstream.
On systems where a single CPU is present, the GIC may not support
having SGIs delivered to a target list. In that case, we use the
self-SGI mechanism to allow the interrupt to be delivered locally.
Tested-by: Fabio Estevam <fabio.estevam@xxxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/irqchip/irq-gic.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -769,6 +769,13 @@ static void gic_raise_softirq(const stru
int cpu;
unsigned long flags, map = 0;
+ if (unlikely(nr_cpu_ids == 1)) {
+ /* Only one CPU? let's do a self-IPI... */
+ writel_relaxed(2 << 24 | irq,
+ gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
+ return;
+ }
+
raw_spin_lock_irqsave(&irq_controller_lock, flags);
/* Convert our logical CPU mask into a physical one. */
Patches currently in stable-queue which might be from marc.zyngier@xxxxxxx are
queue-4.7/irqchip-gic-allow-self-sgis-for-smp-on-up-configurations.patch
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