[PATCH 04/17] x86: MCE: Use a call vector to call the 64bit mce handler

[Andi Kleen <andi@firstfloor.org>]

From: Andi Kleen <ak@linux.intel.com>

Allows to call different machine check handlers from the low
level machine check entry vector.

This is needed for later when it will be used for 32bit too.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 arch/x86/kernel/cpu/mcheck/mce.c |   23 ++++++++++++-----------
 arch/x86/kernel/cpu/mcheck/mce.h |    3 ++-
 arch/x86/kernel/entry_64.S       |    2 +-
 3 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 26048b5..13ba422 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -39,6 +39,16 @@
 
 #include "mce.h"
 
+/* Handle unconfigured int18 (should never happen) */
+static void unexpected_machine_check(struct pt_regs *regs, long error_code)
+{
+	printk(KERN_ERR "CPU#%d: Unexpected int18 (Machine Check).\n",
+	       smp_processor_id());
+}
+
+/* Call the installed machine check handler for this CPU setup. */
+void (*machine_check_vector)(struct pt_regs *, long error_code) =
+						unexpected_machine_check;
 #ifdef CONFIG_X86_64
 
 #define MISC_MCELOG_MINOR	227
@@ -716,6 +726,8 @@ void __cpuinit mcheck_init(struct cpuinfo_x86 *c)
 	}
 	mce_cpu_quirks(c);
 
+	machine_check_vector = do_machine_check;
+
 	mce_init(NULL);
 	mce_cpu_features(c);
 	mce_init_timer();
@@ -1290,17 +1302,6 @@ int mce_disabled;
 int nr_mce_banks;
 EXPORT_SYMBOL_GPL(nr_mce_banks);	/* non-fatal.o */
 
-/* Handle unconfigured int18 (should never happen) */
-static void unexpected_machine_check(struct pt_regs *regs, long error_code)
-{
-	printk(KERN_ERR "CPU#%d: Unexpected int18 (Machine Check).\n",
-	       smp_processor_id());
-}
-
-/* Call the installed machine check handler for this CPU setup. */
-void (*machine_check_vector)(struct pt_regs *, long error_code) =
-						unexpected_machine_check;
-
 /* This has to be run for each processor */
 void mcheck_init(struct cpuinfo_x86 *c)
 {
diff --git a/arch/x86/kernel/cpu/mcheck/mce.h b/arch/x86/kernel/cpu/mcheck/mce.h
index 6c763de..def7e34 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.h
+++ b/arch/x86/kernel/cpu/mcheck/mce.h
@@ -7,11 +7,12 @@ extern void intel_p5_mcheck_init(struct cpuinfo_x86 *c);
 extern void intel_p6_mcheck_init(struct cpuinfo_x86 *c);
 extern void winchip_mcheck_init(struct cpuinfo_x86 *c);
 
-#ifdef CONFIG_X86_32
 
 /* Call the installed machine check handler for this CPU setup. */
 extern void (*machine_check_vector)(struct pt_regs *, long error_code);
 
+#ifdef CONFIG_X86_32
+
 extern int nr_mce_banks;
 
 extern void intel_set_thermal_handler(void);
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 38946c6..63276c4 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -1382,7 +1382,7 @@ paranoiderrorentry stack_segment do_stack_segment
 errorentry general_protection do_general_protection
 errorentry page_fault do_page_fault
 #ifdef CONFIG_X86_MCE
-paranoidzeroentry machine_check do_machine_check
+paranoidzeroentry machine_check *machine_check_vector(%rip)
 #endif
 
 	/*
-- 
1.6.0.2