hugetlb: pass NULL to kobj_to_hstate() if nid is unused

We can pass NULL to kobj_to_hstate() directly when nid is unused to
simplify the code. No functional change intended.

Link: https://lkml.kernel.org/r/20220901120030.63318-7-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index cc1d857..10c63fe 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3763,8 +3763,7 @@ HSTATE_ATTR_WO(demote);
 static ssize_t demote_size_show(struct kobject *kobj,
                                        struct kobj_attribute *attr, char *buf)
 {
-       int nid;
-       struct hstate *h = kobj_to_hstate(kobj, &nid);
+       struct hstate *h = kobj_to_hstate(kobj, NULL);
        unsigned long demote_size = (PAGE_SIZE << h->demote_order) / SZ_1K;
 
        return sysfs_emit(buf, "%lukB\n", demote_size);
@@ -3777,7 +3776,6 @@ static ssize_t demote_size_store(struct kobject *kobj,
        struct hstate *h, *demote_hstate;
        unsigned long demote_size;
        unsigned int demote_order;
-       int nid;
 
        demote_size = (unsigned long)memparse(buf, NULL);
 
@@ -3789,7 +3787,7 @@ static ssize_t demote_size_store(struct kobject *kobj,
                return -EINVAL;
 
        /* demote order must be smaller than hstate order */
-       h = kobj_to_hstate(kobj, &nid);
+       h = kobj_to_hstate(kobj, NULL);
        if (demote_order >= h->order)
                return -EINVAL;