linux-kernel - [tip:irq/core] genirq/cpuhotplug: Remove irq disabling logic

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Date:   Thu, 22 Jun 2017 09:53:44 -0700
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, tglx@...utronix.de, hpa@...or.com,
        marc.zyngier@....com, mpe@...erman.id.au, hch@....de,
        axboe@...nel.dk, keith.busch@...el.com,
        linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: [tip:irq/core] genirq/cpuhotplug: Remove irq disabling logic

Commit-ID:  0dd945ff4647a1f29c6ae8f4f9a69c8f37c994cf
Gitweb:     http://git.kernel.org/tip/0dd945ff4647a1f29c6ae8f4f9a69c8f37c994cf
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Tue, 20 Jun 2017 01:37:25 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 22 Jun 2017 18:21:16 +0200

genirq/cpuhotplug: Remove irq disabling logic

This is called from stop_machine() with interrupts disabled. No point in
disabling them some more.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Keith Busch <keith.busch@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Christoph Hellwig <hch@....de>
Link: http://lkml.kernel.org/r/20170619235445.198042748@linutronix.de

---
 kernel/irq/cpuhotplug.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/kernel/irq/cpuhotplug.c b/kernel/irq/cpuhotplug.c
index 011f8c4..7051398 100644
--- a/kernel/irq/cpuhotplug.c
+++ b/kernel/irq/cpuhotplug.c
@@ -59,11 +59,8 @@ static bool migrate_one_irq(struct irq_desc *desc)
  */
 void irq_migrate_all_off_this_cpu(void)
 {
-	unsigned int irq;
 	struct irq_desc *desc;
-	unsigned long flags;
-
-	local_irq_save(flags);
+	unsigned int irq;
 
 	for_each_active_irq(irq) {
 		bool affinity_broken;
@@ -73,10 +70,9 @@ void irq_migrate_all_off_this_cpu(void)
 		affinity_broken = migrate_one_irq(desc);
 		raw_spin_unlock(&desc->lock);
 
-		if (affinity_broken)
-			pr_warn_ratelimited("IRQ%u no longer affine to CPU%u\n",
+		if (affinity_broken) {
+			pr_warn_ratelimited("IRQ %u: no longer affine to CPU%u\n",
 					    irq, smp_processor_id());
+		}
 	}
-
-	local_irq_restore(flags);
 }