linux-kernel - [PATCH 1/2] Revert "arm64: use cpu_online_mask when using forced irq_set

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Message-Id: <1409131806-11276-1-git-send-email-byungchul.park@lge.com>
Date:	Wed, 27 Aug 2014 18:30:06 +0900
From:	byungchul.park@....com
To:	will.deacon@....com
Cc:	sudeep.holla@....com, catalin.marinas@....com,
	linux-kernel@...r.kernel.org,
	Byungchul Park <byungchul.park@....com>
Subject: [PATCH 1/2] Revert "arm64: use cpu_online_mask when using forced irq_set_affinity"

From: Byungchul Park <byungchul.park@....com>

This reverts commit 601c942176d8ad8334118bddb747e3720bed24f8.

This patch is designed to ensure that the cpu being offlined is not
present in the affinity mask. But it is a bad idea to overwrite the
affinity variable with cpu_online_mask, even in case that the current
affinity already includes onlined cpus.

So revert this patch to replace it with another one doing exactly
what it intends.

Signed-off-by: Byungchul Park <byungchul.park@....com>
---
 arch/arm64/kernel/irq.c |   10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c
index 0f08dfd..473e5db 100644
--- a/arch/arm64/kernel/irq.c
+++ b/arch/arm64/kernel/irq.c
@@ -97,15 +97,11 @@ static bool migrate_one_irq(struct irq_desc *desc)
 	if (irqd_is_per_cpu(d) || !cpumask_test_cpu(smp_processor_id(), affinity))
 		return false;
 
-	if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids)
+	if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
+		affinity = cpu_online_mask;
 		ret = true;
+	}
 
-	/*
-	 * when using forced irq_set_affinity we must ensure that the cpu
-	 * being offlined is not present in the affinity mask, it may be
-	 * selected as the target CPU otherwise
-	 */
-	affinity = cpu_online_mask;
 	c = irq_data_get_irq_chip(d);
 	if (!c->irq_set_affinity)
 		pr_debug("IRQ%u: unable to set affinity\n", d->irq);
-- 
1.7.9.5

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