linux-kernel - Re: [PATCH] decnet: remove macro-local declarations

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Message-ID: <alpine.DEB.2.10.1511061142440.2378@hadrien>
Date:	Fri, 6 Nov 2015 11:57:34 +0100 (CET)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	David Miller <davem@...emloft.net>
cc:	kernel-janitors@...r.kernel.org,
	linux-decnet-user@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, lkp@...el.com,
	roopa@...ulusnetworks.com, rshearma@...cade.com,
	ebiederm@...ssion.com
Subject: Re: [PATCH] decnet: remove macro-local declarations

> > Would it be preferable to remove the macro entirely and inline the for
> > loop header?
>
> Could you show me an example of how this would look exactly?

One possible solution is below.  I moved the initialization of the nh
pointer inside the loop to reduce the size of the loop header.  One could
also inline fi->fib_nh[nhsel] where it occurs, but it seemed that that
would make quite long expressions.

julia

diff --git a/net/decnet/dn_table.c b/net/decnet/dn_table.c
index 1540b50..509ae82 100644
--- a/net/decnet/dn_table.c
+++ b/net/decnet/dn_table.c
@@ -60,11 +60,6 @@ struct dn_hash

 #define dz_key_0(key)		((key).datum = 0)

-#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
-	for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
-
-#define endfor_nexthops(fi) }
-
 #define DN_MAX_DIVISOR 1024
 #define DN_S_ZOMBIE 1
 #define DN_S_ACCESSED 2
@@ -227,7 +222,7 @@ static struct dn_zone *dn_new_zone(struct dn_hash *table, int z)
 static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct nlattr *attrs[], struct dn_fib_info *fi)
 {
 	struct rtnexthop *nhp;
-	int nhlen;
+	int nhlen, nhsel;

 	if (attrs[RTA_PRIORITY] &&
 	    nla_get_u32(attrs[RTA_PRIORITY]) != fi->fib_priority)
@@ -246,8 +241,9 @@ static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct nlattr
 	nhp = nla_data(attrs[RTA_MULTIPATH]);
 	nhlen = nla_len(attrs[RTA_MULTIPATH]);

-	for_nexthops(fi) {
+	for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
 		int attrlen = nhlen - sizeof(struct rtnexthop);
+		const struct dn_fib_nh *nh = &fi->fib_nh[nhsel];
 		__le16 gw;

 		if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
@@ -264,7 +260,7 @@ static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct nlattr
 				return 1;
 		}
 		nhp = RTNH_NEXT(nhp);
-	} endfor_nexthops(fi);
+	}

 	return 0;
 }
@@ -345,11 +341,13 @@ static int dn_fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
 	if (fi->fib_nhs > 1) {
 		struct rtnexthop *nhp;
 		struct nlattr *mp_head;
+		int nhsel;

 		if (!(mp_head = nla_nest_start(skb, RTA_MULTIPATH)))
 			goto errout;

-		for_nexthops(fi) {
+		for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
+			const struct dn_fib_nh *nh = &fi->fib_nh[nhsel];
 			if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp))))
 				goto errout;

@@ -362,7 +360,7 @@ static int dn_fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
 				goto errout;

 			nhp->rtnh_len = skb_tail_pointer(skb) - (unsigned char *)nhp;
-		} endfor_nexthops(fi);
+		}

 		nla_nest_end(skb, mp_head);
 	}
--
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