linux-kernel - [PATCH] irqchip/gic: Use smp

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Date: Wed, 29 May 2024 17:52:30 -0700
From: Samuel Holland <samuel.holland@...ive.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Samuel Holland <samuel.holland@...ive.com>,
	Marc Zyngier <maz@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] irqchip/gic: Use smp_wmb() instead of dmb(ishst)

This is equivalent on ARM, but also works on other architectures.

Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
---

 drivers/irqchip/irq-gic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 98aa383e39db..dc2e4018a40c 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -839,7 +839,7 @@ static void gic_ipi_send_mask(struct irq_data *d, const struct cpumask *mask)
 	 * Ensure that stores to Normal memory are visible to the
 	 * other CPUs before they observe us issuing the IPI.
 	 */
-	dmb(ishst);
+	smp_wmb();
 
 	/* this always happens on GIC0 */
 	writel_relaxed(map << 16 | d->hwirq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
-- 
2.44.1