[PATCH] i386: clean up identify_cpu

identify_cpu() is used to identify both the boot CPU and secondary
CPUs, but it performs some actions which only apply to the boot CPU.
Those functions are therefore really __init functions, but because
they're called by identify_cpu(), they must be marked __cpuinit.

This patch splits identify_cpu() into identify_boot_cpu() and
identify_secondary_cpu(), and calls the appropriate init functions
from each.  Also, identify_boot_cpu() and all the functions it
dominates are marked __init.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>

arch/i386/kernel/cpu/common.c

@@ -394,7 +394,7 @@ __setup("serialnumber", x86_serial_nr_setup);
 /*
  * This does the hard work of actually picking apart the CPU stuff...
  */
-void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
+static void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
 {
 	int i;
 
@@ -505,15 +505,22 @@ void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
 
 	/* Init Machine Check Exception if available. */
 	mcheck_init(c);
+}
 
-	if (c == &boot_cpu_data)
-		sysenter_setup();
+void __init identify_boot_cpu(void)
+{
+	identify_cpu(&boot_cpu_data);
+	sysenter_setup();
 	enable_sep_cpu();
+	mtrr_bp_init();
+}
 
-	if (c == &boot_cpu_data)
-		mtrr_bp_init();
-	else
-		mtrr_ap_init();
+void __cpuinit identify_secondary_cpu(struct cpuinfo_x86 *c)
+{
+	BUG_ON(c == &boot_cpu_data);
+	identify_cpu(c);
+	enable_sep_cpu();
+	mtrr_ap_init();
 }
 
 #ifdef CONFIG_X86_HT

arch/i386/kernel/smpboot.c

@@ -155,7 +155,7 @@ static void __cpuinit smp_store_cpu_info(int id)
 
 	*c = boot_cpu_data;
 	if (id!=0)
-		identify_cpu(c);
+		identify_secondary_cpu(c);
 	/*
 	 * Mask B, Pentium, but not Pentium MMX
 	 */

arch/i386/kernel/sysenter.c

@@ -72,7 +72,7 @@ extern const char vsyscall_int80_start, vsyscall_int80_end;
 extern const char vsyscall_sysenter_start, vsyscall_sysenter_end;
 static struct page *syscall_pages[1];
 
-int __cpuinit sysenter_setup(void)
+int __init sysenter_setup(void)
 {
 	void *syscall_page = (void *)get_zeroed_page(GFP_ATOMIC);
 	syscall_pages[0] = virt_to_page(syscall_page);

include/asm-i386/processor.h

@@ -116,7 +116,8 @@ extern char ignore_fpu_irq;
 
 void __init cpu_detect(struct cpuinfo_x86 *c);
 
-extern void identify_cpu(struct cpuinfo_x86 *);
+extern void identify_boot_cpu(void);
+extern void identify_secondary_cpu(struct cpuinfo_x86 *);
 extern void print_cpu_info(struct cpuinfo_x86 *);
 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
 extern unsigned short num_cache_leaves;