linux-kernel - [PATCH v4 02/18] arm64: stacktrace: Factor out on_accessible_stack

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Message-Id: <20220715061027.1612149-3-kaleshsingh@google.com>
Date:   Thu, 14 Jul 2022 23:10:11 -0700
From:   Kalesh Singh <kaleshsingh@...gle.com>
To:     maz@...nel.org, mark.rutland@....com, broonie@...nel.org,
        madvenka@...ux.microsoft.com
Cc:     will@...nel.org, qperret@...gle.com, tabba@...gle.com,
        kaleshsingh@...gle.com, james.morse@....com,
        alexandru.elisei@....com, suzuki.poulose@....com,
        catalin.marinas@....com, andreyknvl@...il.com,
        russell.king@...cle.com, vincenzo.frascino@....com,
        mhiramat@...nel.org, ast@...nel.org, drjones@...hat.com,
        wangkefeng.wang@...wei.com, elver@...gle.com, keirf@...gle.com,
        yuzenghui@...wei.com, ardb@...nel.org, oupton@...gle.com,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, android-mm@...gle.com,
        kernel-team@...roid.com
Subject: [PATCH v4 02/18] arm64: stacktrace: Factor out on_accessible_stack_common()

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@...gle.com>
---
 arch/arm64/include/asm/stacktrace.h        |  8 ++------
 arch/arm64/include/asm/stacktrace/common.h | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/include/asm/stacktrace.h b/arch/arm64/include/asm/stacktrace.h
index 79f455b37c84..a4f8b84fb459 100644
--- a/arch/arm64/include/asm/stacktrace.h
+++ b/arch/arm64/include/asm/stacktrace.h
@@ -56,7 +56,6 @@ static inline bool on_overflow_stack(unsigned long sp, unsigned long size,
 			struct stack_info *info) { return false; }
 #endif
 
-
 /*
  * We can only safely access per-cpu stacks from current in a non-preemptible
  * context.
@@ -65,8 +64,8 @@ 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;
@@ -74,12 +73,9 @@ 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;
 
 	return false;
 }
-
 #endif	/* __ASM_STACKTRACE_H */
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)
 {
-- 
2.37.0.170.g444d1eabd0-goog