linux-kernel - [PATCH v3 1/2] genirq: Provide irq_gc_{lock_irqsave,unlock

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Message-Id: <1473775109-4192-1-git-send-email-boris.brezillon@free-electrons.com>
Date:   Tue, 13 Sep 2016 15:58:28 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>
Cc:     Nicolas Ferre <nicolas.ferre@...el.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        linux-kernel@...r.kernel.org,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        stable@...r.kernel.org
Subject: [PATCH v3 1/2] genirq: Provide irq_gc_{lock_irqsave,unlock_irqrestore}() helpers

Some irqchip drivers need to take the generic chip lock outside of the
irq context.

Provide the irq_gc_{lock_irqsave,unlock_irqrestore}() helpers to allow
one to disable irqs while entering a critical section protected by
gc->lock.

Note that we do not provide optimized version of these helpers for !SMP,
because they are not called from the hot-path.

Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc: <stable@...r.kernel.org>
---
 include/linux/irq.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index b52424eaa0ed..b13668f97648 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -945,6 +945,12 @@ static inline void irq_gc_lock(struct irq_chip_generic *gc) { }
 static inline void irq_gc_unlock(struct irq_chip_generic *gc) { }
 #endif
 
+#define irq_gc_lock_irqsave(gc, flags)	\
+	raw_spin_lock_irqsave(&(gc)->lock, flags)
+
+#define irq_gc_unlock_irqrestore(gc, flags)	\
+	raw_spin_unlock_irqrestore(&(gc)->lock, flags)
+
 static inline void irq_reg_writel(struct irq_chip_generic *gc,
 				  u32 val, int reg_offset)
 {
-- 
2.7.4