[PATCH v6 02/17] arm64: stacktrace: Factor out on_accessible_stack_common()

[Kalesh Singh]

Move common on_accessible_stack checks to stacktrace/common.h. This is
used in the implementation of the nVHE hypervisor unwinder later in
this series.

Signed-off-by: Kalesh Singh <kaleshsingh at google.com>
Reviewed-by: Fuad Tabba <tabba at google.com>
Reviewed-by: Mark Brown <broonie at kernel.org>
Tested-by: Fuad Tabba <tabba at google.com>
---

Changes in v6:
  - Add Fuad's Tested-by tag

Changes in v5:
  - Add Reviewed-by tags from Mark Brown and Fuad
  - Remove random whitespace change, per Mark Brown

 arch/arm64/include/asm/stacktrace.h        |  6 ++----
 arch/arm64/include/asm/stacktrace/common.h | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/include/asm/stacktrace.h b/arch/arm64/include/asm/stacktrace.h
index 79f455b37c84..43f4b4a6d383 100644
--- a/arch/arm64/include/asm/stacktrace.h
+++ b/arch/arm64/include/asm/stacktrace.h
@@ -65,8 +65,8 @@ static inline bool on_accessible_stack(const struct task_struct *tsk,
 				       unsigned long sp, unsigned long size,
 				       struct stack_info *info)
 {
-	if (info)
-		info->type = STACK_TYPE_UNKNOWN;
+	if (on_accessible_stack_common(tsk, sp, size, info))
+		return true;
 
 	if (on_task_stack(tsk, sp, size, info))
 		return true;
@@ -74,8 +74,6 @@ static inline bool on_accessible_stack(const struct task_struct *tsk,
 		return false;
 	if (on_irq_stack(sp, size, info))
 		return true;
-	if (on_overflow_stack(sp, size, info))
-		return true;
 	if (on_sdei_stack(sp, size, info))
 		return true;
 
diff --git a/arch/arm64/include/asm/stacktrace/common.h b/arch/arm64/include/asm/stacktrace/common.h
index 64ae4f6b06fe..f58b786460d3 100644
--- a/arch/arm64/include/asm/stacktrace/common.h
+++ b/arch/arm64/include/asm/stacktrace/common.h
@@ -62,6 +62,9 @@ struct unwind_state {
 	struct task_struct *task;
 };
 
+static inline bool on_overflow_stack(unsigned long sp, unsigned long size,
+				     struct stack_info *info);
+
 static inline bool on_stack(unsigned long sp, unsigned long size,
 			    unsigned long low, unsigned long high,
 			    enum stack_type type, struct stack_info *info)
@@ -80,6 +83,21 @@ static inline bool on_stack(unsigned long sp, unsigned long size,
 	return true;
 }
 
+static inline bool on_accessible_stack_common(const struct task_struct *tsk,
+					      unsigned long sp,
+					      unsigned long size,
+					      struct stack_info *info)
+{
+	if (info)
+		info->type = STACK_TYPE_UNKNOWN;
+
+	/*
+	 * Both the kernel and nvhe hypervisor make use of
+	 * an overflow_stack
+	 */
+	return on_overflow_stack(sp, size, info);
+}
+
 static inline void unwind_init_common(struct unwind_state *state,
 				      struct task_struct *task)
 {
-- 
2.37.1.359.gd136c6c3e2-goog