quota: code cleanup for hash bits calculation

Code cleanup for hash bits calculation by
calling ilog2().

Link: https://lore.kernel.org/r/20190923135223.27674-1-cgxu519@zoho.com.cn
Signed-off-by: Chengguang Xu <cgxu519@zoho.com.cn>
Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 00a3c6df2ea374b1ddc40f9cd001ef116dfecb10..26812a67ed77bca0551604c3663d3cf7f334382f 100644 (file)
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -2981,11 +2981,7 @@ static int __init dquot_init(void)
 
        /* Find power-of-two hlist_heads which can fit into allocation */
        nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
-       dq_hash_bits = 0;
-       do {
-               dq_hash_bits++;
-       } while (nr_hash >> dq_hash_bits);
-       dq_hash_bits--;
+       dq_hash_bits = ilog2(nr_hash);
 
        nr_hash = 1UL << dq_hash_bits;
        dq_hash_mask = nr_hash - 1;