linux-kernel - [PATCH v2 1/2] MIPS: only register MT SMP ops if MT is supported

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Date:   Sat, 18 Dec 2021 11:05:10 +0100
From:   Sander Vanheule <sander@...nheule.net>
To:     linux-mips@...r.kernel.org
Cc:     INAGAKI Hiroshi <musashino.open@...il.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Paul Burton <paulburton@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-kernel@...r.kernel.org,
        Sander Vanheule <sander@...nheule.net>
Subject: [PATCH v2 1/2] MIPS: only register MT SMP ops if MT is supported

Verify that the current CPU actually supports multi-threading before
registering MT SMP ops, instead of unconditionally registering them if
the kernel is compiled with CONFIG_MIPS_MT_SMP.

Suggested-by: Jiaxun Yang <jiaxun.yang@...goat.com>
Signed-off-by: Sander Vanheule <sander@...nheule.net>
---
 arch/mips/include/asm/smp-ops.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/mips/include/asm/smp-ops.h b/arch/mips/include/asm/smp-ops.h
index 65618ff1280c..864aea803984 100644
--- a/arch/mips/include/asm/smp-ops.h
+++ b/arch/mips/include/asm/smp-ops.h
@@ -101,6 +101,9 @@ static inline int register_vsmp_smp_ops(void)
 #ifdef CONFIG_MIPS_MT_SMP
 	extern const struct plat_smp_ops vsmp_smp_ops;
 
+	if (!cpu_has_mipsmt)
+		return -ENODEV;
+
 	register_smp_ops(&vsmp_smp_ops);
 
 	return 0;
-- 
2.33.1