[PATCH RFC v2 08/21] kasan: remove __kasan_unpoison_stack

[Andrey Konovalov]

There's no need for __kasan_unpoison_stack() helper, as it's only
currently used in a single place. Removing it also removes undeed
arithmetic.

No functional changes.

Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Link: https://linux-review.googlesource.com/id/Ie5ba549d445292fe629b4a96735e4034957bcc50
---
 mm/kasan/common.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index a3e67d49b893..9008fc6b0810 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -59,18 +59,12 @@ void kasan_disable_current(void)
 #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
 
 #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;
-
-	kasan_unpoison_memory(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);
+
+	kasan_unpoison_memory(base, THREAD_SIZE);
 }
 
 /* Unpoison the stack for the current task beyond a watermark sp value. */
-- 
2.29.0.rc1.297.gfa9743e501-goog