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

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@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20161024173844.23038-3-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.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@decadent.org.uk>

diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index 25f24dc..06afb95 100644 (file)
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -16,9 +16,7 @@ obj-y                 := intel_cacheinfo.o scattered.o topology.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

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index ad95476..b699b48 100644 (file)
--- 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
 }

diff --git a/arch/x86/kernel/cpu/bugs_64.c b/arch/x86/kernel/cpu/bugs_64.c
deleted file mode 100644 (file)
index 04f0fe5..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)
-       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);
-}