diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 2754ce0c833435..b71dfe7c505953 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -64,18 +64,12 @@ void kasan_unpoison_range(const void *address, size_t size)
 }
 
 #if CONFIG_KASAN_STACK
-static void __kasan_unpoison_stack(struct task_struct *task, const void *sp)
-{
-	void *base = task_stack_page(task);
-	size_t size = sp - base;
-
-	unpoison_range(base, size);
-}
-
 /* Unpoison the entire stack for a task. */
 void kasan_unpoison_task_stack(struct task_struct *task)
 {
-	__kasan_unpoison_stack(task, task_stack_page(task) + THREAD_SIZE);
+	void *base = task_stack_page(task);
+
+	unpoison_range(base, THREAD_SIZE);
 }
 
 /* Unpoison the stack for the current task beyond a watermark sp value. */