ptrace_bps is already an array of size HBP_NUM_MAX. But we use
hardcoded index 0 while fetching/updating it. Convert such code
to loop over array.

Signed-off-by: Ravi Bangoria <redacted>
---
  arch/powerpc/kernel/hw_breakpoint.c |  7 +++++--
  arch/powerpc/kernel/process.c       |  6 +++++-
  arch/powerpc/kernel/ptrace.c        | 28 +++++++++++++++++++++-------
  3 files changed, 31 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c
index f4d48f87dcb8..b27aca623267 100644
--- a/arch/powerpc/kernel/hw_breakpoint.c
+++ b/arch/powerpc/kernel/hw_breakpoint.c

@@ -419,10 +419,13 @@ NOKPROBE_SYMBOL(hw_breakpoint_exceptions_notify);
   */
  void flush_ptrace_hw_breakpoint(struct task_struct *tsk)
  {
+	int i;
  	struct thread_struct *t = &tsk->thread;
  
-	unregister_hw_breakpoint(t->ptrace_bps[0]);
-	t->ptrace_bps[0] = NULL;
+	for (i = 0; i < nr_wp_slots(); i++) {
+		unregister_hw_breakpoint(t->ptrace_bps[i]);
+		t->ptrace_bps[i] = NULL;
+	}
  }
  
  void hw_breakpoint_pmu_read(struct perf_event *bp)

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 42ff62ef749c..b9ab740fcacf 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c

@@ -1628,6 +1628,9 @@ int copy_thread_tls(unsigned long clone_flags, unsigned long usp,
  	void (*f)(void);
  	unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;
  	struct thread_info *ti = task_thread_info(p);
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+	int i;
+#endif

  
  	klp_init_thread_info(p);
  

@@ -1687,7 +1690,8 @@ int copy_thread_tls(unsigned long clone_flags, unsigned long usp,
  	p->thread.ksp_limit = (unsigned long)end_of_stack(p);
  #endif
  #ifdef CONFIG_HAVE_HW_BREAKPOINT
-	p->thread.ptrace_bps[0] = NULL;
+	for (i = 0; i < nr_wp_slots(); i++)
+		p->thread.ptrace_bps[i] = NULL;
  #endif
  
  	p->thread.fp_save_area = NULL;

diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index f6d7955fc61e..e2651f86d56f 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c

@@ -2829,6 +2829,19 @@ static int set_dac_range(struct task_struct *child,
  }
  #endif /* CONFIG_PPC_ADV_DEBUG_DAC_RANGE */
  
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+static int empty_ptrace_bp(struct thread_struct *thread)
+{
+	int i;
+
+	for (i = 0; i < nr_wp_slots(); i++) {
+		if (!thread->ptrace_bps[i])
+			return i;
+	}
+	return -1;
+}
+#endif

+
  #ifndef CONFIG_PPC_ADV_DEBUG_REGS
  static int empty_hw_brk(struct thread_struct *thread)
  {

@@ -2915,8 +2928,9 @@ static long ppc_set_hwdebug(struct task_struct *child,
  		len = 1;
  	else
  		return -EINVAL;
-	bp = thread->ptrace_bps[0];
-	if (bp)
+
+	i = empty_ptrace_bp(thread);
+	if (i < 0)
  		return -ENOSPC;
  
  	/* Create a new breakpoint request if one doesn't exist already */

@@ -2925,14 +2939,14 @@ static long ppc_set_hwdebug(struct task_struct *child,
  	attr.bp_len = len;
  	arch_bp_generic_fields(brk.type, &attr.bp_type);
  
-	thread->ptrace_bps[0] = bp = register_user_hw_breakpoint(&attr,
+	thread->ptrace_bps[i] = bp = register_user_hw_breakpoint(&attr,
  					       ptrace_triggered, NULL, child);
  	if (IS_ERR(bp)) {
-		thread->ptrace_bps[0] = NULL;
+		thread->ptrace_bps[i] = NULL;
  		return PTR_ERR(bp);
  	}
  
-	return 1;
+	return i + 1;
  #endif /* CONFIG_HAVE_HW_BREAKPOINT */
  
  	if (bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT)

@@ -2979,10 +2993,10 @@ static long ppc_del_hwdebug(struct task_struct *child, long data)
  		return -EINVAL;
  
  #ifdef CONFIG_HAVE_HW_BREAKPOINT
-	bp = thread->ptrace_bps[0];
+	bp = thread->ptrace_bps[data - 1];