From: Seung-Woo Kim <sw0312.kim@samsung.com>
Date: Mon, 25 Jan 2021 06:40:42 +0000 (+0900)
Subject: amlogic: mm: Add aml_task_stack() in amlogic vmap
X-Git-Tag: submit/tizen/20210204.012538~16
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e4fd24aeabed64cd82033a53f0ef130a07f2932d;p=platform%2Fkernel%2Flinux-amlogic.git

amlogic: mm: Add aml_task_stack() in amlogic vmap

In kerne, there are several places to get stack page address of
task and when using AMLOGIC_VMAP, task_stack_page() does not
return page address. Add aml_task_stack() to get task stack page
for amlogic vmap.

Change-Id: I64cd827f98bec74357227dcc3ed546807b5406e3
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
---

diff --git a/drivers/amlogic/memory_ext/vmap_stack.c b/drivers/amlogic/memory_ext/vmap_stack.c
index 387fb805b496..7a9898361a9b 100644
--- a/drivers/amlogic/memory_ext/vmap_stack.c
+++ b/drivers/amlogic/memory_ext/vmap_stack.c
@@ -753,6 +753,22 @@ static void check_and_map_stack_shadow(unsigned long addr)
 }
 #endif
 
+void *aml_task_stack(struct task_struct *tsk)
+{
+	unsigned long stack = (unsigned long)tsk->stack;
+	unsigned long addr;
+	struct page *page;
+
+	if (unlikely(!is_vmap_addr(stack))) {
+		/* stack get from kmalloc, currently no method to get page */
+		return NULL;
+	}
+
+	addr = stack + STACK_TOP_PAGE_OFF;
+	page = vmalloc_to_page((const void *)addr);
+	return page ? page_address(page) : NULL;
+}
+
 void *aml_stack_alloc(int node, struct task_struct *tsk)
 {
 	unsigned long bitmap_no, raw_start;
diff --git a/include/linux/amlogic/vmap_stack.h b/include/linux/amlogic/vmap_stack.h
index 9b1f86897ea8..419e908abe19 100644
--- a/include/linux/amlogic/vmap_stack.h
+++ b/include/linux/amlogic/vmap_stack.h
@@ -76,6 +76,7 @@ extern void  __setup_vmap_stack(unsigned long off);
 extern void  update_vmap_stack(int diff);
 extern int   get_vmap_stack_size(void);
 extern int   is_vmap_addr(unsigned long addr);
+extern void *aml_task_stack(struct task_struct *tsk);
 extern void  aml_stack_free(struct task_struct *tsk);
 extern void *aml_stack_alloc(int node, struct task_struct *tsk);
 extern void  aml_account_task_stack(struct task_struct *tsk, int account);