linux-kernel - [PATCH v3 1/2] x86/mce: Get rid of mcheck_intel_therm

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Date:   Mon,  1 Feb 2021 15:27:03 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     X86 ML <x86@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Amit Kucheria <amitk@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org
Subject: [PATCH v3 1/2] x86/mce: Get rid of mcheck_intel_therm_init()

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

Move the APIC_LVTTHMR read which needs to happen on the BSP, to
intel_init_thermal(). One less boot dependency.

No functional changes.

Signed-off-by: Borislav Petkov <bp@...e.de>
---
 arch/x86/include/asm/mce.h            |  6 ------
 arch/x86/kernel/cpu/mce/core.c        |  1 -
 arch/x86/kernel/cpu/mce/therm_throt.c | 15 ++++-----------
 3 files changed, 4 insertions(+), 18 deletions(-)

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 56cdeaac76a0..def9aa5e1fa4 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -304,12 +304,6 @@ extern int (*platform_thermal_package_notify)(__u64 msr_val);
  * callback has rate control */
 extern bool (*platform_thermal_package_rate_control)(void);
 
-#ifdef CONFIG_X86_THERMAL_VECTOR
-extern void mcheck_intel_therm_init(void);
-#else
-static inline void mcheck_intel_therm_init(void) { }
-#endif
-
 /*
  * Used by APEI to report memory error via /dev/mcelog
  */
diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index e133ce1e562b..c68e21b4ea0d 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -2178,7 +2178,6 @@ __setup("mce", mcheck_enable);
 
 int __init mcheck_init(void)
 {
-	mcheck_intel_therm_init();
 	mce_register_decode_chain(&early_nb);
 	mce_register_decode_chain(&mce_uc_nb);
 	mce_register_decode_chain(&mce_default_nb);
diff --git a/arch/x86/kernel/cpu/mce/therm_throt.c b/arch/x86/kernel/cpu/mce/therm_throt.c
index a7cd2d203ced..5b15d7cef1d1 100644
--- a/arch/x86/kernel/cpu/mce/therm_throt.c
+++ b/arch/x86/kernel/cpu/mce/therm_throt.c
@@ -633,17 +633,6 @@ static int intel_thermal_supported(struct cpuinfo_x86 *c)
 	return 1;
 }
 
-void __init mcheck_intel_therm_init(void)
-{
-	/*
-	 * This function is only called on boot CPU. Save the init thermal
-	 * LVT value on BSP and use that value to restore APs' thermal LVT
-	 * entry BIOS programmed later
-	 */
-	if (intel_thermal_supported(&boot_cpu_data))
-		lvtthmr_init = apic_read(APIC_LVTTHMR);
-}
-
 void intel_init_thermal(struct cpuinfo_x86 *c)
 {
 	unsigned int cpu = smp_processor_id();
@@ -653,6 +642,10 @@ void intel_init_thermal(struct cpuinfo_x86 *c)
 	if (!intel_thermal_supported(c))
 		return;
 
+	/* On the BSP? */
+	if (c == &boot_cpu_data)
+		lvtthmr_init = apic_read(APIC_LVTTHMR);
+
 	/*
 	 * First check if its enabled already, in which case there might
 	 * be some SMM goo which handles it, so we can't even put a handler
-- 
2.29.2