linux-kernel - [tip: objtool/core] csky/cpu: Make sure arch_cpu_idle

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Message-ID: <167848169468.5837.15267243328787227151.tip-bot2@tip-bot2>
Date:   Fri, 10 Mar 2023 20:54:54 -0000
From:   "tip-bot2 for Josh Poimboeuf" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Guo Ren <guoren@...nel.org>, Josh Poimboeuf <jpoimboe@...nel.org>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: objtool/core] csky/cpu: Make sure arch_cpu_idle_dead() doesn't return

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     1b2442a835a0acc7d76ae2f48ca7a94f962b29c8
Gitweb:        https://git.kernel.org/tip/1b2442a835a0acc7d76ae2f48ca7a94f962b29c8
Author:        Josh Poimboeuf <jpoimboe@...nel.org>
AuthorDate:    Mon, 13 Feb 2023 23:05:39 -08:00
Committer:     Josh Poimboeuf <jpoimboe@...nel.org>
CommitterDate: Mon, 06 Mar 2023 15:34:05 -08:00

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>
Link: https://lore.kernel.org/r/1e9ecc3d248e82973e80bc336fc9f97e3ba2708d.1676358308.git.jpoimboe@kernel.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 b45d107..0ec20ef 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