linux-kernel - [PATCH 5.10 005/452] riscv: Fix irq

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Date:   Tue,  7 Jun 2022 18:57:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Samuel Holland <samuel@...lland.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Palmer Dabbelt <palmer@...osinc.com>
Subject: [PATCH 5.10 005/452] riscv: Fix irq_work when SMP is disabled

From: Samuel Holland <samuel@...lland.org>

commit 2273272823db6f67d57761df8116ae32e7f05bed upstream.

irq_work is triggered via an IPI, but the IPI infrastructure is not
included in uniprocessor kernels. As a result, irq_work never runs.
Fall back to the tick-based irq_work implementation on uniprocessor
configurations.

Fixes: 298447928bb1 ("riscv: Support irq_work via self IPIs")
Signed-off-by: Samuel Holland <samuel@...lland.org>
Reviewed-by: Heiko Stuebner <heiko@...ech.de>
Link: https://lore.kernel.org/r/20220430030025.58405-1-samuel@sholland.org
Cc: stable@...r.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/riscv/include/asm/irq_work.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/riscv/include/asm/irq_work.h
+++ b/arch/riscv/include/asm/irq_work.h
@@ -4,7 +4,7 @@
 
 static inline bool arch_irq_work_has_interrupt(void)
 {
-	return true;
+	return IS_ENABLED(CONFIG_SMP);
 }
 extern void arch_irq_work_raise(void);
 #endif /* _ASM_RISCV_IRQ_WORK_H */