[PATCH] powerpc: export debug register save function for KVM

Bharat Bhushan
2013-05-07T09:52:50Z

KVM need this function when switching from vcpu to user-space
thread. My subsequent patch will use this function.

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
---
arch/powerpc/include/asm/switch_to.h | 4 ++++
arch/powerpc/kernel/process.c | 3 ++-
2 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/include/asm/switch_to.h b/arch/powerpc/include/asm/switch_to.h
index 200d763..50b357f 100644
--- a/arch/powerpc/include/asm/switch_to.h
+++ b/arch/powerpc/include/asm/switch_to.h
@@ -30,6 +30,10 @@ extern void enable_kernel_spe(void);
extern void giveup_spe(struct task_struct *);
extern void load_up_spe(struct task_struct *);

+#ifdef CONFIG_PPC_ADV_DEBUG_REGS
+extern void switch_booke_debug_regs(struct thread_struct *new_thread);
+#endif
+
#ifndef CONFIG_SMP
extern void discard_lazy_cpu_state(void);
#else
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index ca89375..a938138 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -362,12 +362,13 @@ static void prime_debug_regs(struct thread_struct *thread)
* debug registers, set the debug registers from the values
* stored in the new thread.
*/
-static void switch_booke_debug_regs(struct thread_struct *new_thread)
+void switch_booke_debug_regs(struct thread_struct *new_thread)
{
if ((current->thread.debug.dbcr0 & DBCR0_IDM)
|| (new_thread->debug.dbcr0 & DBCR0_IDM))
prime_debug_regs(new_thread);
}
+EXPORT_SYMBOL(switch_booke_debug_regs);
#else /* !CONFIG_PPC_ADV_DEBUG_REGS */
#ifndef CONFIG_HAVE_HW_BREAKPOINT
static void set_debug_reg_defaults(struct thread_struct *thread)
--
1.5.6.5