mm/khugepaged: use KMEM_CACHE()

We got some late review commits during review of commit b4c9ffb
("mm/khugepaged: remove definition of struct khugepaged_mm_slot").  No
need to keep the old cache name "khugepaged_mm_slot", let's simply use
KMEM_CACHE().

Link: https://lkml.kernel.org/r/[email protected]
Fixes: b4c9ffb ("mm/khugepaged: remove definition of struct khugepaged_mm_slot")
Signed-off-by: Wei Yang <[email protected]>
Acked-by: Lance Yang <[email protected]>
Reviewed-by: Dev Jain <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Acked-by: Zi Yan <[email protected]>
Reviewed-by: Raghavendra K T <[email protected]>
Cc: Kiryl Shutsemau <[email protected]>
Cc: xu xin <[email protected]>
Cc: SeongJae Park <[email protected]>
Cc: Nico Pache <[email protected]>
Cc: Baolin Wang <[email protected]>
Cc: Barry Song <[email protected]>
Cc: Chengming Zhou <[email protected]>
Cc: Dan Carpenter <[email protected]>
Cc: Kiryl Shutsemau <[email protected]>
Cc: Liam Howlett <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: Ryan Roberts <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: RichardWeiYang

mm/khugepaged.c

@@ -376,10 +376,7 @@ int hugepage_madvise(struct vm_area_struct *vma,
 
 int __init khugepaged_init(void)
 {
-	mm_slot_cache = kmem_cache_create("khugepaged_mm_slot",
-					  sizeof(struct mm_slot),
-					  __alignof__(struct mm_slot),
-					  0, NULL);
+	mm_slot_cache = KMEM_CACHE(mm_slot, 0);
 	if (!mm_slot_cache)
 		return -ENOMEM;