linux-kernel - [PATCH] SMT: State SMT is disabled even with nosmt and without "=force"

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Message-Id: <20181004172227.10094-1-bp@alien8.de>
Date:   Thu,  4 Oct 2018 19:22:27 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>, x86@...nel.org
Subject: [PATCH] SMT: State SMT is disabled even with nosmt and without "=force"

From: Borislav Petkov <bp@...e.de>

When booting with "nosmt=force" a message is issued into dmesg to
confirm that SMT has been force-disabled but such a message is not
issued when only "nosmt" is on the kernel command line.

Fix that.

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: x86@...nel.org
---
 kernel/cpu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 668c8553e171..3c7f3b4c453c 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -383,6 +383,7 @@ void __init cpu_smt_disable(bool force)
 		pr_info("SMT: Force disabled\n");
 		cpu_smt_control = CPU_SMT_FORCE_DISABLED;
 	} else {
+		pr_info("SMT: disabled\n");
 		cpu_smt_control = CPU_SMT_DISABLED;
 	}
 }
-- 
2.19.0.271.gfe8321ec057f