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From:   Jiexun Wang <wangjiexun@tinylab.org>
To:     samuel@sholland.org
Cc:     conor@kernel.org, guoren@kernel.org, paul.walmsley@sifive.com,
        palmer@dabbelt.com, aou@eecs.berkeley.edu,
        linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
        falcon@tinylab.org, jszhang@kernel.org, tglx@linutronix.de,
        Jiexun Wang <wangjiexun@tinylab.org>
Subject: [PATCH v3] RISC-V: Fix wrong use of CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK
Date:   Wed, 13 Sep 2023 13:29:40 +0800
Message-Id: <20230913052940.374686-1-wangjiexun@tinylab.org>
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If configuration options SOFTIRQ_ON_OWN_STACK and PREEMPT_RT 
are enabled simultaneously under RISC-V architecture,
it will result in a compilation failure:

arch/riscv/kernel/irq.c:64:6: error: redefinition of 'do_softirq_own_stack'
   64 | void do_softirq_own_stack(void)
      |      ^~~~~~~~~~~~~~~~~~~~
In file included from ./arch/riscv/include/generated/asm/softirq_stack.h:1,
                 from arch/riscv/kernel/irq.c:15:
./include/asm-generic/softirq_stack.h:8:20: note: previous definition of 'do_softirq_own_stack' was here
    8 | static inline void do_softirq_own_stack(void)
      |                    ^~~~~~~~~~~~~~~~~~~~
      
After changing CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK to CONFIG_SOFTIRQ_ON_OWN_STACK,
compilation can be successful.

Fixes: dd69d07a5a6c ("riscv: stack: Support HAVE_SOFTIRQ_ON_OWN_STACK")
Reviewed-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Jiexun Wang <wangjiexun@tinylab.org>
---
Changes in v3:
- changed to a more suitable subject line
- fix the #endif comment at the bottom of the function

Changes in v2:
- changed to a more suitable subject line
- add a Fixes tag

---
 arch/riscv/kernel/irq.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c
index a8efa053c4a5..9cc0a7669271 100644
--- a/arch/riscv/kernel/irq.c
+++ b/arch/riscv/kernel/irq.c
@@ -60,7 +60,7 @@ static void init_irq_stacks(void)
 }
 #endif /* CONFIG_VMAP_STACK */
 
-#ifdef CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK
+#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
 void do_softirq_own_stack(void)
 {
 #ifdef CONFIG_IRQ_STACKS
@@ -92,7 +92,7 @@ void do_softirq_own_stack(void)
 #endif
 		__do_softirq();
 }
-#endif /* CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK */
+#endif /* CONFIG_SOFTIRQ_ON_OWN_STACK */
 
 #else
 static void init_irq_stacks(void) {}
-- 
2.34.1