[tip:x86/timers] x86/CPU: Call detect_nopl() only on the BSP - tip-bot for Borislav Petkov

From: tip-bot for Borislav Petkov <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: tglx@linutronix.de, bp@alien8.de, linux-kernel@vger.kernel.org,
	bp@suse.de, pasha.tatashin@oracle.com, mingo@kernel.org,
	hpa@zytor.com
Subject: [tip:x86/timers] x86/CPU: Call detect_nopl() only on the BSP
Date: Thu, 19 Jul 2018 15:26:43 -0700	[thread overview]
Message-ID: <tip-9b3661cd7e5400689ed168a7275e75af333177e6@git.kernel.org> (raw)
In-Reply-To: <20180719205545.16512-11-pasha.tatashin@oracle.com>

Commit-ID:  9b3661cd7e5400689ed168a7275e75af333177e6
Gitweb:     https://git.kernel.org/tip/9b3661cd7e5400689ed168a7275e75af333177e6
Author:     Borislav Petkov <bp@alien8.de>
AuthorDate: Thu, 19 Jul 2018 16:55:29 -0400
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Fri, 20 Jul 2018 00:02:39 +0200

x86/CPU: Call detect_nopl() only on the BSP

Make it use the setup_* variants and have it be called only on the BSP and
drop the call in generic_identify() - X86_FEATURE_NOPL will be replicated
to the APs through the forced caps. Helps to keep the mess at a manageable
level.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: steven.sistare@oracle.com
Cc: daniel.m.jordan@oracle.com
Cc: linux@armlinux.org.uk
Cc: schwidefsky@de.ibm.com
Cc: heiko.carstens@de.ibm.com
Cc: john.stultz@linaro.org
Cc: sboyd@codeaurora.org
Cc: hpa@zytor.com
Cc: douly.fnst@cn.fujitsu.com
Cc: peterz@infradead.org
Cc: prarit@redhat.com
Cc: feng.tang@intel.com
Cc: pmladek@suse.com
Cc: gnomes@lxorguk.ukuu.org.uk
Cc: linux-s390@vger.kernel.org
Cc: boris.ostrovsky@oracle.com
Cc: jgross@suse.com
Cc: pbonzini@redhat.com
Link: https://lkml.kernel.org/r/20180719205545.16512-11-pasha.tatashin@oracle.com

---
 arch/x86/kernel/cpu/common.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 71281ac43b15..46408a8cdf62 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1024,12 +1024,12 @@ static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c)
  * unless we can find a reliable way to detect all the broken cases.
  * Enable it explicitly on 64-bit for non-constant inputs of cpu_has().
  */
-static void detect_nopl(struct cpuinfo_x86 *c)
+static void detect_nopl(void)
 {
 #ifdef CONFIG_X86_32
-	clear_cpu_cap(c, X86_FEATURE_NOPL);
+	setup_clear_cpu_cap(X86_FEATURE_NOPL);
 #else
-	set_cpu_cap(c, X86_FEATURE_NOPL);
+	setup_force_cpu_cap(X86_FEATURE_NOPL);
 #endif
 }
 
@@ -1108,7 +1108,7 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
 	if (!pgtable_l5_enabled())
 		setup_clear_cpu_cap(X86_FEATURE_LA57);
 
-	detect_nopl(c);
+	detect_nopl();
 }
 
 void __init early_cpu_init(void)
@@ -1206,8 +1206,6 @@ static void generic_identify(struct cpuinfo_x86 *c)
 
 	get_model_name(c); /* Default name */
 
-	detect_nopl(c);
-
 	detect_null_seg_behavior(c);
 
 	/*
