[PATCH] zsmalloc: fix obj_to_head use page_private(page) as value but not pointer

[Hui Zhu]

In function obj_malloc:
        if (!class->huge)
                /* record handle in the header of allocated chunk */
                link->handle = handle;
        else
                /* record handle in first_page->private */
                set_page_private(first_page, handle);
The huge's page save handle to private directly.

But in obj_to_head:
        if (class->huge) {
                VM_BUG_ON(!is_first_page(page));
                return page_private(page);
        } else
                return *(unsigned long *)obj;
It is used as a pointer.

So change obj_to_head use page_private(page) as value but not pointer
in obj_to_head.

Signed-off-by: Hui Zhu <zhu...@xiaomi.com>
---
 mm/zsmalloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index f135b1b..e881d4f 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -824,7 +824,7 @@ static unsigned long obj_to_head(struct size_class *class, 
struct page *page,
 {
        if (class->huge) {
                VM_BUG_ON(!is_first_page(page));
-               return *(unsigned long *)page_private(page);
+               return page_private(page);
        } else
                return *(unsigned long *)obj;
 }
-- 
1.9.1

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