linux-kernel - [PATCHv2 3/8] genirq: Allow architectures to override set_handle

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Message-Id: <20210302101211.2328-4-mark.rutland@arm.com>
Date:   Tue,  2 Mar 2021 10:12:06 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     catalin.marinas@....com, james.morse@....com, marcan@...can.st,
        mark.rutland@....com, maz@...nel.org, tglx@...utronix.de,
        will@...nel.org
Subject: [PATCHv2 3/8] genirq: Allow architectures to override set_handle_irq() fallback

From: Marc Zyngier <maz@...nel.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 uniform 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@...nel.org>
[Mark: expand commit message]
Signed-off-by: Mark Rutland <mark.rutland@....com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Hector Martin <marcan@...can.st>
Cc: James Morse <james.morse@....com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Will Deacon <will@...nel.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