linux-kernel - [tip:x86/cpu] x86/cpu: Merge bugs.c and bugs

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Message-ID: <tip-62a67e123e058a67db58bc6a14354dd037bafd0a@git.kernel.org>
Date:   Tue, 25 Oct 2016 03:33:36 -0700
From:   tip-bot for Borislav Petkov <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, brgerst@...il.com, bp@...e.de, hpa@...or.com,
        dvlasenk@...hat.com, luto@...nel.org, jpoimboe@...hat.com,
        torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        peterz@...radead.org, bp@...en8.de, mingo@...nel.org
Subject: [tip:x86/cpu] x86/cpu: Merge bugs.c and bugs_64.c

Commit-ID:  62a67e123e058a67db58bc6a14354dd037bafd0a
Gitweb:     http://git.kernel.org/tip/62a67e123e058a67db58bc6a14354dd037bafd0a
Author:     Borislav Petkov <bp@...e.de>
AuthorDate: Mon, 24 Oct 2016 19:38:43 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 25 Oct 2016 11:48:50 +0200

x86/cpu: Merge bugs.c and bugs_64.c

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>
---
 arch/x86/kernel/cpu/Makefile  |  4 +---
 arch/x86/kernel/cpu/bugs.c    | 26 ++++++++++++++++++++++----
 arch/x86/kernel/cpu/bugs_64.c | 33 ---------------------------------
 3 files changed, 23 insertions(+), 40 deletions(-)

diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index 4a8697f..33b6367 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -20,13 +20,11 @@ obj-y			:= intel_cacheinfo.o scattered.o topology.o
 obj-y			+= common.o
 obj-y			+= rdrand.o
 obj-y			+= match.o
+obj-y			+= bugs.o
 
 obj-$(CONFIG_PROC_FS)	+= proc.o
 obj-$(CONFIG_X86_FEATURE_NAMES) += capflags.o powerflags.o
 
-obj-$(CONFIG_X86_32)	+= bugs.o
-obj-$(CONFIG_X86_64)	+= bugs_64.o
-
 obj-$(CONFIG_CPU_SUP_INTEL)		+= intel.o
 obj-$(CONFIG_CPU_SUP_AMD)		+= amd.o
 obj-$(CONFIG_CPU_SUP_CYRIX_32)		+= cyrix.o
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index bd17db1..a44ef52 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -16,15 +16,19 @@
 #include <asm/msr.h>
 #include <asm/paravirt.h>
 #include <asm/alternative.h>
+#include <asm/pgtable.h>
+#include <asm/cacheflush.h>
 
 void __init check_bugs(void)
 {
 	identify_boot_cpu();
-#ifndef CONFIG_SMP
-	pr_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 whether we are able to run this kernel safely on SMP.
 	 *
@@ -40,4 +44,18 @@ void __init check_bugs(void)
 	alternative_instructions();
 
 	fpu__init_check_bugs();
+#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
 }
diff --git a/arch/x86/kernel/cpu/bugs_64.c b/arch/x86/kernel/cpu/bugs_64.c
deleted file mode 100644
index a972ac4..0000000
--- 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)
-	pr_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);
-}