linux-kernel - Re: [PATCH AUTOSEL 5.9 087/147] genirq: Add stub for set_handle_irq() when !GENERIC_IRQ_MULTI

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Message-ID: <20201101235257.GC2092@sasha-vm>
Date:   Sun, 1 Nov 2020 18:52:57 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Zhen Lei <thunder.leizhen@...wei.com>
Subject: Re: [PATCH AUTOSEL 5.9 087/147] genirq: Add stub for
 set_handle_irq() when !GENERIC_IRQ_MULTI_HANDLER

On Tue, Oct 27, 2020 at 08:51:15AM +0000, Marc Zyngier wrote:
>On 2020-10-26 23:48, Sasha Levin wrote:
>>From: Zhen Lei <thunder.leizhen@...wei.com>
>>
>>[ Upstream commit ea0c80d1764449acf2f70fdb25aec33800cd0348 ]
>>
>>In order to avoid compilation errors when a driver references 
>>set_handle_irq(),
>>but that the architecture doesn't select GENERIC_IRQ_MULTI_HANDLER,
>>add a stub function that will just WARN_ON_ONCE() if ever used.
>>
>>Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
>>[maz: commit message]
>>Signed-off-by: Marc Zyngier <maz@...nel.org>
>>Link: https://lore.kernel.org/r/20200924071754.4509-2-thunder.leizhen@huawei.com
>>Signed-off-by: Sasha Levin <sashal@...nel.org>
>>---
>> include/linux/irq.h | 6 ++++++
>> 1 file changed, 6 insertions(+)
>>
>>diff --git a/include/linux/irq.h b/include/linux/irq.h
>>index 1b7f4dfee35b3..b167baef88c0b 100644
>>--- a/include/linux/irq.h
>>+++ b/include/linux/irq.h
>>@@ -1252,6 +1252,12 @@ int __init set_handle_irq(void
>>(*handle_irq)(struct pt_regs *));
>>  * top-level IRQ handler.
>>  */
>> extern void (*handle_arch_irq)(struct pt_regs *) __ro_after_init;
>>+#else
>>+#define set_handle_irq(handle_irq)		\
>>+	do {					\
>>+		(void)handle_irq;		\
>>+		WARN_ON(1);			\
>>+	} while (0)
>> #endif
>>
>> #endif /* _LINUX_IRQ_H */
>
>What is the reason for this backport? The only user is a driver that
>isn't getting backported (d59f7d159891 and following patches).

I'll drop it, thanks!

-- 
Thanks,
Sasha