linux-kernel - [PATCH] staging: lustre: lnet: Replace list_for_each with list_for_each

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Date:   Fri, 15 Sep 2017 18:41:48 -0600
From:   Haneen Mohammed <hamohammed.sa@...il.com>
To:     outreachy-kernel <outreachy-kernel@...glegroups.com>
Cc:     Oleg Drokin <oleg.drokin@...el.com>,
        Andreas Dilger <andreas.dilger@...el.com>,
        James Simmons <jsimmons@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        lustre-devel@...ts.lustre.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] staging: lustre: lnet: Replace list_for_each with
 list_for_each_entry

Replace use of the combination of list_for_each and list_entry
with list_for_each_entry to simplify the code and remove variables
that are used only in list_for_each.
Issue found and corrected using Coccinelle script:

@r@
expression head, member, e;
type T1, T2, T3;
iterator name list_for_each, list_for_each_entry;
identifier pos, var;
@@

-T1 *pos;
...when!=pos=e;

-list_for_each(pos, head)
+list_for_each_entry(var, head, member)
{
...when!=pos=e;
   when!=T3 *var;
-var = list_entry(pos, T2, member);
...when!=pos=e;
}
...when!=pos=e;

Signed-off-by: Haneen Mohammed <hamohammed.sa@...il.com>
---
 drivers/staging/lustre/lnet/lnet/router.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/lustre/lnet/lnet/router.c b/drivers/staging/lustre/lnet/lnet/router.c
index 3df101b..b8eba33 100644
--- a/drivers/staging/lustre/lnet/lnet/router.c
+++ b/drivers/staging/lustre/lnet/lnet/router.c
@@ -222,15 +222,12 @@ struct lnet_remotenet *
 lnet_find_net_locked(__u32 net)
 {
 	struct lnet_remotenet *rnet;
-	struct list_head *tmp;
 	struct list_head *rn_list;
 
 	LASSERT(!the_lnet.ln_shutdown);
 
 	rn_list = lnet_net2rnethash(net);
-	list_for_each(tmp, rn_list) {
-		rnet = list_entry(tmp, struct lnet_remotenet, lrn_list);
-
+	list_for_each_entry(rnet, rn_list, lrn_list) {
 		if (rnet->lrn_net == net)
 			return rnet;
 	}
@@ -243,7 +240,6 @@ static void lnet_shuffle_seed(void)
 	__u32 lnd_type, seed[2];
 	struct timespec64 ts;
 	struct lnet_ni *ni;
-	struct list_head *tmp;
 
 	if (seeded)
 		return;
@@ -254,8 +250,7 @@ static void lnet_shuffle_seed(void)
 	 * Nodes with small feet have little entropy
 	 * the NID for this node gives the most entropy in the low bits
 	 */
-	list_for_each(tmp, &the_lnet.ln_nis) {
-		ni = list_entry(tmp, struct lnet_ni, ni_list);
+	list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
 		lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
 
 		if (lnd_type != LOLND)
-- 
2.7.4