This patch enables the use of wrapper routines to access the debug/breakpoint
registers.

Original-patch-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com>
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
---
 arch/x86/kernel/smpboot.c |    3 +++
 arch/x86/power/cpu_32.c   |   13 +++----------
 arch/x86/power/cpu_64.c   |   12 +++---------
 3 files changed, 9 insertions(+), 19 deletions(-)

Index: linux-2.6-tip.hbkpt/arch/x86/kernel/smpboot.c
===================================================================
--- linux-2.6-tip.hbkpt.orig/arch/x86/kernel/smpboot.c
+++ linux-2.6-tip.hbkpt/arch/x86/kernel/smpboot.c
@@ -63,6 +63,7 @@
 #include <asm/apic.h>
 #include <asm/setup.h>
 #include <asm/uv/uv.h>
+#include <asm/debugreg.h>
 #include <linux/mc146818rtc.h>
 
 #include <asm/smpboot_hooks.h>
@@ -326,6 +327,7 @@ notrace static void __cpuinit start_seco
 	setup_secondary_clock();
 
 	wmb();
+	load_debug_registers();
 	cpu_idle();
 }
 
@@ -1252,6 +1254,7 @@ void cpu_disable_common(void)
 	remove_cpu_from_maps(cpu);
 	unlock_vector_lock();
 	fixup_irqs();
+	hw_breakpoint_disable();
 }
 
 int native_cpu_disable(void)
Index: linux-2.6-tip.hbkpt/arch/x86/power/cpu_32.c
===================================================================
--- linux-2.6-tip.hbkpt.orig/arch/x86/power/cpu_32.c
+++ linux-2.6-tip.hbkpt/arch/x86/power/cpu_32.c
@@ -13,6 +13,7 @@
 #include <asm/mce.h>
 #include <asm/xcr.h>
 #include <asm/suspend.h>
+#include <asm/debugreg.h>
 
 static struct saved_context saved_context;
 
@@ -48,6 +49,7 @@ static void __save_processor_state(struc
 	ctxt->cr2 = read_cr2();
 	ctxt->cr3 = read_cr3();
 	ctxt->cr4 = read_cr4_safe();
+	hw_breakpoint_disable();
 }
 
 /* Needed by apm.c */
@@ -83,16 +85,7 @@ static void fix_processor_context(void)
 	/*
 	 * Now maybe reload the debug registers
 	 */
-	if (current->thread.debugreg7) {
-		set_debugreg(current->thread.debugreg[0], 0);
-		set_debugreg(current->thread.debugreg[1], 1);
-		set_debugreg(current->thread.debugreg[2], 2);
-		set_debugreg(current->thread.debugreg[3], 3);
-		/* no 4 and 5 */
-		set_debugreg(current->thread.debugreg6, 6);
-		set_debugreg(current->thread.debugreg7, 7);
-	}
-
+	load_debug_registers();
 }
 
 static void __restore_processor_state(struct saved_context *ctxt)
Index: linux-2.6-tip.hbkpt/arch/x86/power/cpu_64.c
===================================================================
--- linux-2.6-tip.hbkpt.orig/arch/x86/power/cpu_64.c
+++ linux-2.6-tip.hbkpt/arch/x86/power/cpu_64.c
@@ -16,6 +16,7 @@
 #include <asm/mtrr.h>
 #include <asm/xcr.h>
 #include <asm/suspend.h>
+#include <asm/debugreg.h>
 
 static void fix_processor_context(void);
 
@@ -71,6 +72,7 @@ static void __save_processor_state(struc
 	ctxt->cr3 = read_cr3();
 	ctxt->cr4 = read_cr4();
 	ctxt->cr8 = read_cr8();
+	hw_breakpoint_disable();
 }
 
 void save_processor_state(void)
@@ -162,13 +164,5 @@ static void fix_processor_context(void)
 	/*
 	 * Now maybe reload the debug registers
 	 */
-	if (current->thread.debugreg7){
-		set_debugreg(current->thread.debugreg[0], 0);
-		set_debugreg(current->thread.debugreg[1], 1);
-		set_debugreg(current->thread.debugreg[2], 2);
-		set_debugreg(current->thread.debugreg[3], 3);
-                /* no 4 and 5 */
-                loaddebug(&current->thread, 6);
-                loaddebug(&current->thread, 7);
-	}
+	load_debug_registers();
 }

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