linux-kernel - [PATCH v2 05/24] csky/cpu: Make sure arch_cpu_idle

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Message-Id: <1e9ecc3d248e82973e80bc336fc9f97e3ba2708d.1676358308.git.jpoimboe@kernel.org>
Date:   Mon, 13 Feb 2023 23:05:39 -0800
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     linux-kernel@...r.kernel.org
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Subject: [PATCH v2 05/24] csky/cpu: Make sure arch_cpu_idle_dead() doesn't return

arch_cpu_idle_dead() doesn't return.  Make that more explicit with a
BUG().

BUG() is preferable to unreachable() because BUG() is a more explicit
failure mode and avoids undefined behavior like falling off the edge of
the function into whatever code happens to be next.

Acked-by: Guo Ren <guoren@...nel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 arch/csky/kernel/smp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/csky/kernel/smp.c b/arch/csky/kernel/smp.c
index b45d1073307f..0ec20efaf5fd 100644
--- a/arch/csky/kernel/smp.c
+++ b/arch/csky/kernel/smp.c
@@ -317,5 +317,7 @@ void arch_cpu_idle_dead(void)
 		"jmpi	csky_start_secondary"
 		:
 		: "r" (secondary_stack));
+
+	BUG();
 }
 #endif
-- 
2.39.1