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Commit 17f557e5 authored by K.Prasad's avatar K.Prasad Committed by Frederic Weisbecker
Browse files

hw-breakpoints: cleanup HW Breakpoint registers before kexec 



This patch disables Hardware breakpoints before doing a 'kexec' on the machine
so that the cpu doesn't keep debug registers values which would be out of
sync for the new image.

Original-patch-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarK.Prasad <prasad@linux.vnet.ibm.com>
Reviewed-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
parent 72f674d2

arch/x86/kernel/machine_kexec_32.c

+2 −0
Original line number Diff line number Diff line
@@ -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 @@ void machine_kexec(struct kimage *image) 


	/* Interrupts aren't acceptable while we reboot */

	local_irq_disable();

	hw_breakpoint_disable();



	if (image->preserve_context) {

#ifdef CONFIG_X86_IO_APIC

arch/x86/kernel/machine_kexec_64.c

+2 −0
Original line number Diff line number Diff line
@@ -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 @@ void machine_kexec(struct kimage *image) 


	/* Interrupts aren't acceptable while we reboot */

	local_irq_disable();

	hw_breakpoint_disable();



	if (image->preserve_context) {

#ifdef CONFIG_X86_IO_APIC