[Patch 09/11] Cleanup HW Breakpoint registers before kexec

["K.Prasad" <prasad@linux.vnet.ibm.com>]

[-- Attachment #1: modify_kexec_09 --]
[-- Type: text/plain, Size: 1760 bytes --]

From: Alan Stern <stern@rowland.harvard.edu>

This patch disables Hardware breakpoints before doing a 'kexec' on the machine.

[K.Prasad: Split-out from the bigger patch and minor changes following
           re-basing]

Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
---
 arch/x86/kernel/machine_kexec_32.c |    2 ++
 arch/x86/kernel/machine_kexec_64.c |    2 ++
 2 files changed, 4 insertions(+)

Index: arch/x86/kernel/machine_kexec_32.c
===================================================================
--- arch/x86/kernel/machine_kexec_32.c.orig	2009-04-01 20:53:43.000000000 +0530
+++ arch/x86/kernel/machine_kexec_32.c	2009-04-01 20:54:46.000000000 +0530
@@ -25,6 +25,7 @@
 #include <asm/desc.h>
 #include <asm/system.h>
 #include <asm/cacheflush.h>
+#include <asm/debugreg.h>
 
 static void set_idt(void *newidt, __u16 limit)
 {
@@ -202,6 +203,7 @@
 
 	/* Interrupts aren't acceptable while we reboot */
 	local_irq_disable();
+	hw_breakpoint_disable();
 
 	if (image->preserve_context) {
 #ifdef CONFIG_X86_IO_APIC
Index: arch/x86/kernel/machine_kexec_64.c
===================================================================
--- arch/x86/kernel/machine_kexec_64.c.orig	2009-04-01 20:53:43.000000000 +0530
+++ arch/x86/kernel/machine_kexec_64.c	2009-04-01 20:54:46.000000000 +0530
@@ -18,6 +18,7 @@
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>
 #include <asm/mmu_context.h>
+#include <asm/debugreg.h>
 
 static int init_one_level2_page(struct kimage *image, pgd_t *pgd,
 				unsigned long addr)
@@ -282,6 +283,7 @@
 
 	/* Interrupts aren't acceptable while we reboot */
 	local_irq_disable();
+	hw_breakpoint_disable();
 
 	if (image->preserve_context) {
 #ifdef CONFIG_X86_IO_APIC