linux-kernel - [PATCH 3.2 045/104] x86/cpu: Merge bugs.c and bugs

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Message-ID: <lsq.1520823814.536601340@decadent.org.uk>
Date:   Mon, 12 Mar 2018 03:03:34 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Josh Poimboeuf" <jpoimboe@...hat.com>,
        "Denys Vlasenko" <dvlasenk@...hat.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Borislav Petkov" <bp@...en8.de>, "Borislav Petkov" <bp@...e.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Andy Lutomirski" <luto@...nel.org>,
        "Brian Gerst" <brgerst@...il.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Ingo Molnar" <mingo@...nel.org>
Subject: [PATCH 3.2 045/104] x86/cpu: Merge bugs.c and bugs_64.c

3.2.101-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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

commit 62a67e123e058a67db58bc6a14354dd037bafd0a upstream.

Should be easier when following boot paths. It probably is a left over
from the x86 unification eons ago.

No functionality change.

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20161024173844.23038-3-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
[bwh: Backported to 3.2:
 - Add #ifdef around functions that are not used on x86_64
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -16,9 +16,7 @@ obj-y			:= intel_cacheinfo.o scattered.o
 obj-y			+= proc.o capflags.o powerflags.o common.o
 obj-y			+= vmware.o hypervisor.o sched.o mshyperv.o
 obj-y			+= rdrand.o
-
-obj-$(CONFIG_X86_32)	+= bugs.o
-obj-$(CONFIG_X86_64)	+= bugs_64.o
+obj-y			+= bugs.o
 
 obj-$(CONFIG_CPU_SUP_INTEL)		+= intel.o
 obj-$(CONFIG_CPU_SUP_AMD)		+= amd.o
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -16,6 +16,10 @@
 #include <asm/msr.h>
 #include <asm/paravirt.h>
 #include <asm/alternative.h>
+#include <asm/pgtable.h>
+#include <asm/cacheflush.h>
+
+#ifdef CONFIG_X86_32
 
 static int __init no_halt(char *s)
 {
@@ -156,6 +160,7 @@ static void __init check_config(void)
 #endif
 }
 
+#endif /* CONFIG_X86_32 */
 
 void __init check_bugs(void)
 {
@@ -168,10 +173,13 @@ void __init check_bugs(void)
 #endif
 
 	identify_boot_cpu();
-#ifndef CONFIG_SMP
-	printk(KERN_INFO "CPU: ");
-	print_cpu_info(&boot_cpu_data);
-#endif
+
+	if (!IS_ENABLED(CONFIG_SMP)) {
+		pr_info("CPU: ");
+		print_cpu_info(&boot_cpu_data);
+	}
+
+#ifdef CONFIG_X86_32
 	check_config();
 	check_fpu();
 	check_hlt();
@@ -179,4 +187,18 @@ void __init check_bugs(void)
 	init_utsname()->machine[1] =
 		'0' + (boot_cpu_data.x86 > 6 ? 6 : boot_cpu_data.x86);
 	alternative_instructions();
+#else /* CONFIG_X86_64 */
+	alternative_instructions();
+
+	/*
+	 * Make sure the first 2MB area is not mapped by huge pages
+	 * There are typically fixed size MTRRs in there and overlapping
+	 * MTRRs into large pages causes slow downs.
+	 *
+	 * Right now we don't do that with gbpages because there seems
+	 * very little benefit for that case.
+	 */
+	if (!direct_gbpages)
+		set_memory_4k((unsigned long)__va(0), 1);
+#endif
 }
--- a/arch/x86/kernel/cpu/bugs_64.c
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- *  Copyright (C) 1994  Linus Torvalds
- *  Copyright (C) 2000  SuSE
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <asm/alternative.h>
-#include <asm/bugs.h>
-#include <asm/processor.h>
-#include <asm/mtrr.h>
-#include <asm/cacheflush.h>
-
-void __init check_bugs(void)
-{
-	identify_boot_cpu();
-#if !defined(CONFIG_SMP)
-	printk(KERN_INFO "CPU: ");
-	print_cpu_info(&boot_cpu_data);
-#endif
-	alternative_instructions();
-
-	/*
-	 * Make sure the first 2MB area is not mapped by huge pages
-	 * There are typically fixed size MTRRs in there and overlapping
-	 * MTRRs into large pages causes slow downs.
-	 *
-	 * Right now we don't do that with gbpages because there seems
-	 * very little benefit for that case.
-	 */
-	if (!direct_gbpages)
-		set_memory_4k((unsigned long)__va(0), 1);
-}