linux-kernel - [PATCH v2 7/7] riscv: traps: mark do_irq() as __always

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Message-ID: <20240720171232.1753-8-jszhang@kernel.org>
Date: Sun, 21 Jul 2024 01:12:32 +0800
From: Jisheng Zhang <jszhang@...nel.org>
To: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Charlie Jenkins <charlie@...osinc.com>,
	Deepak Gupta <debug@...osinc.com>,
	Clement Leger <cleger@...osinc.com>
Cc: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 7/7] riscv: traps: mark do_irq() as __always_inline

Since do_irq() is only called in traps.c, so mark it as __always_inline
this will allow the compiler to get rid of the stack setup/tear down
code and eliminate a handful of instructions.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 arch/riscv/kernel/traps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index dc1bc84cfe15..030c50cb4e78 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -378,7 +378,7 @@ static void noinstr handle_riscv_irq(struct pt_regs *regs)
 	irq_exit_rcu();
 }
 
-static void noinstr do_irq(struct pt_regs *regs)
+static __always_inline void do_irq(struct pt_regs *regs)
 {
 	irqentry_state_t state = irqentry_enter(regs);
 
-- 
2.43.0