netdev - [PATCH] genetlink: use idr_alloc_cyclic for family->id assignment

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Message-Id: <20190424201853.115414-1-marcel@holtmann.org>
Date:   Wed, 24 Apr 2019 22:18:53 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     netdev@...r.kernel.org
Subject: [PATCH] genetlink: use idr_alloc_cyclic for family->id assignment

When allocating the next family->id it makes more sense to use
idr_alloc_cyclic to avoid re-using a previously used family->id as much
as possible.

Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
---
 net/netlink/genetlink.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 288456090710..f1f2cbd7874e 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -362,8 +362,8 @@ int genl_register_family(struct genl_family *family)
 	} else
 		family->attrbuf = NULL;
 
-	family->id = idr_alloc(&genl_fam_idr, family,
-			       start, end + 1, GFP_KERNEL);
+	family->id = idr_alloc_cyclic(&genl_fam_idr, family,
+				      start, end + 1, GFP_KERNEL);
 	if (family->id < 0) {
 		err = family->id;
 		goto errout_free;
-- 
2.20.1