There are some common codes for stack checking, so factors it out into
the function on_stack().

No functional change.

Signed-off-by: Yunfeng Ye <yeyunf...@huawei.com>
---
v1 -> v2:
 - check 'low' in on_stack() and everybody call on_stack() only

 arch/arm64/include/asm/stacktrace.h | 40 +++++++++++++------------------------
 arch/arm64/kernel/sdei.c            | 28 ++------------------------
 2 files changed, 16 insertions(+), 52 deletions(-)

diff --git a/arch/arm64/include/asm/stacktrace.h 
b/arch/arm64/include/asm/stacktrace.h
index fdb913cc0bcb..fc7613023c19 100644
--- a/arch/arm64/include/asm/stacktrace.h
+++ b/arch/arm64/include/asm/stacktrace.h
@@ -69,12 +69,10 @@ extern void dump_backtrace(struct pt_regs *regs, struct 
task_struct *tsk,

 DECLARE_PER_CPU(unsigned long *, irq_stack_ptr);

-static inline bool on_irq_stack(unsigned long sp,
+static inline bool on_stack(unsigned long sp, unsigned long low,
+                               unsigned long high, enum stack_type type,
                                struct stack_info *info)
 {
-       unsigned long low = (unsigned long)raw_cpu_read(irq_stack_ptr);
-       unsigned long high = low + IRQ_STACK_SIZE;
-
        if (!low)
                return false;

@@ -84,12 +82,20 @@ static inline bool on_irq_stack(unsigned long sp,
        if (info) {
                info->low = low;
                info->high = high;
-               info->type = STACK_TYPE_IRQ;
+               info->type = type;
        }
-
        return true;
 }

+static inline bool on_irq_stack(unsigned long sp,
+                               struct stack_info *info)
+{
+       unsigned long low = (unsigned long)raw_cpu_read(irq_stack_ptr);
+       unsigned long high = low + IRQ_STACK_SIZE;
+
+       return on_stack(sp, low, high, STACK_TYPE_IRQ, info);
+}
+
 static inline bool on_task_stack(const struct task_struct *tsk,
                                 unsigned long sp,
                                 struct stack_info *info)
@@ -97,16 +103,7 @@ static inline bool on_task_stack(const struct task_struct 
*tsk,
        unsigned long low = (unsigned long)task_stack_page(tsk);
        unsigned long high = low + THREAD_SIZE;

-       if (sp < low || sp >= high)
-               return false;
-
-       if (info) {
-               info->low = low;
-               info->high = high;
-               info->type = STACK_TYPE_TASK;
-       }
-
-       return true;
+       return on_stack(sp, low, high, STACK_TYPE_TASK, info);
 }

 #ifdef CONFIG_VMAP_STACK
@@ -118,16 +115,7 @@ static inline bool on_overflow_stack(unsigned long sp,
        unsigned long low = (unsigned long)raw_cpu_ptr(overflow_stack);
        unsigned long high = low + OVERFLOW_STACK_SIZE;

-       if (sp < low || sp >= high)
-               return false;
-
-       if (info) {
-               info->low = low;
-               info->high = high;
-               info->type = STACK_TYPE_OVERFLOW;
-       }
-
-       return true;
+       return on_stack(sp, low, high, STACK_TYPE_OVERFLOW, info);
 }
 #else
 static inline bool on_overflow_stack(unsigned long sp,
diff --git a/arch/arm64/kernel/sdei.c b/arch/arm64/kernel/sdei.c
index d6259dac62b6..3afed808b474 100644
--- a/arch/arm64/kernel/sdei.c
+++ b/arch/arm64/kernel/sdei.c
@@ -95,19 +95,7 @@ static bool on_sdei_normal_stack(unsigned long sp, struct 
stack_info *info)
        unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_normal_ptr);
        unsigned long high = low + SDEI_STACK_SIZE;

-       if (!low)
-               return false;
-
-       if (sp < low || sp >= high)
-               return false;
-
-       if (info) {
-               info->low = low;
-               info->high = high;
-               info->type = STACK_TYPE_SDEI_NORMAL;
-       }
-
-       return true;
+       return on_stack(sp, low, high, STACK_TYPE_SDEI_NORMAL, info);
 }

 static bool on_sdei_critical_stack(unsigned long sp, struct stack_info *info)
@@ -115,19 +103,7 @@ static bool on_sdei_critical_stack(unsigned long sp, 
struct stack_info *info)
        unsigned long low = (unsigned 
long)raw_cpu_read(sdei_stack_critical_ptr);
        unsigned long high = low + SDEI_STACK_SIZE;

-       if (!low)
-               return false;
-
-       if (sp < low || sp >= high)
-               return false;
-
-       if (info) {
-               info->low = low;
-               info->high = high;
-               info->type = STACK_TYPE_SDEI_CRITICAL;
-       }
-
-       return true;
+       return on_stack(sp, low, high, STACK_TYPE_SDEI_CRITICAL, info);
 }

 bool _on_sdei_stack(unsigned long sp, struct stack_info *info)
-- 
1.8.3.1

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