Messages in this thread Patch in this message | | | From | Frederic Weisbecker <> | Subject | [PATCH 09/12] hw-breakpoints: cleanup HW Breakpoint registers before kexec | Date | Wed, 3 Jun 2009 00:43:33 +0200 |
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From: K.Prasad <prasad@linux.vnet.ibm.com>
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: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com> Reviewed-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> --- arch/x86/kernel/machine_kexec_32.c | 2 ++ arch/x86/kernel/machine_kexec_64.c | 2 ++ 2 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/machine_kexec_32.c b/arch/x86/kernel/machine_kexec_32.c index c1c429d..c843f84 100644 --- a/arch/x86/kernel/machine_kexec_32.c +++ b/arch/x86/kernel/machine_kexec_32.c @@ -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 diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c index 84c3bf2..4a8bb82 100644 --- a/arch/x86/kernel/machine_kexec_64.c +++ b/arch/x86/kernel/machine_kexec_64.c @@ -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 -- 1.6.2.3
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