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From:   Mark Rutland <mark.rutland@arm.com>
To:     linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Cc:     catalin.marinas@arm.com, james.morse@arm.com, marcan@marcan.st,
        mark.rutland@arm.com, maz@kernel.org, tglx@linutronix.de,
        will@kernel.org
Subject: [PATCH 3/8] genirq: Allow architectures to override set_handle_irq() fallback
Date:   Fri, 19 Feb 2021 11:38:59 +0000
Message-Id: <20210219113904.41736-4-mark.rutland@arm.com>
In-Reply-To: <20210219113904.41736-1-mark.rutland@arm.com>
References: <20210219113904.41736-1-mark.rutland@arm.com>
Precedence: bulk

From: Marc Zyngier <maz@kernel.org>

Some architectures want to provide the generic set_handle_irq() API, but
for structural reasons need to provide their own implementation. For
example, arm64 needs to do this to provide unifoprm set_handle_irq() and
set_handle_fiq() registration functions.

Make this possible by allowing architectures to provide their own
implementation of set_handle_irq when CONFIG_GENERIC_IRQ_MULTI_HANDLER
is not selected.

Signed-off-by: Marc Zyngier <maz@kernel.org>
[Mark: expand commit message]
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Hector Martin <marcan@marcan.st>
Cc: James Morse <james.morse@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
---
 include/linux/irq.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 2efde6a79b7e..9890180b84fd 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -1258,11 +1258,13 @@ int __init set_handle_irq(void (*handle_irq)(struct pt_regs *));
  */
 extern void (*handle_arch_irq)(struct pt_regs *) __ro_after_init;
 #else
+#ifndef set_handle_irq
 #define set_handle_irq(handle_irq)		\
 	do {					\
 		(void)handle_irq;		\
 		WARN_ON(1);			\
 	} while (0)
 #endif
+#endif
 
 #endif /* _LINUX_IRQ_H */
-- 
2.11.0