linux-kernel - linux-next: build failure after merge of the ida tree

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Date:   Wed, 18 Jul 2018 16:54:06 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Matthew Wilcox <willy@...radead.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        NetFilter <netfilter-devel@...r.kernel.org>
Cc:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Varsha Rao <rvarsha016@...il.com>
Subject: linux-next: build failure after merge of the ida tree

Hi Matthew,

After merging the ida tree, today's linux-next build (x86_64 allmodconfig)
failed like this:

net/netfilter/nf_tables_api.c: In function 'nf_tables_set_alloc_name':
net/netfilter/nf_tables_api.c:3014:8: error: implicit declaration of function 'ida_get_new_above'; did you mean 'idr_get_next_ul'? [-Werror=implicit-function-declaration]
    n = ida_get_new_above(&inuse, tmp, &id);
        ^~~~~~~~~~~~~~~~~
        idr_get_next_ul

Caused by commit

  3f2668c1e101 ("ida: Remove old API")

interacting with commit

  9679150a0bd5 ("netfilter: nf_tables: Use id allocation")

from the netfilter-next tree.

I took a guess and applied the following merge fix patch.

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Wed, 18 Jul 2018 16:42:26 +1000
Subject: [PATCH] ida: merge fix for ida_get_new_above() removal

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 net/netfilter/nf_tables_api.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index b7b5fbcda8dd..151b89174979 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2995,7 +2995,7 @@ static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
 {
 	const struct nft_set *i;
 	const char *p;
-	unsigned int n = 0, id = 0;
+	int id = 0;
 	DEFINE_IDA(inuse);
 
 	p = strchr(name, '%');
@@ -3011,22 +3011,22 @@ static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
 			if (!sscanf(i->name, name, &tmp))
 				continue;
 
-			n = ida_get_new_above(&inuse, tmp, &id);
-			if (n < 0) {
-				if (n == -EAGAIN)
+			id = ida_alloc_min(&inuse, tmp, GFP_KERNEL);
+			if (id < 0) {
+				if (id == -EAGAIN)
 					return -ENOMEM;
 
-				return n;
+				return id;
 			}
 		}
 
-		n = ida_get_new_above(&inuse, 0, &id);
+		id = ida_alloc(&inuse, GFP_KERNEL);
 		ida_destroy(&inuse);
 
-		if (n < 0) {
-			if (n == -EAGAIN)
+		if (id < 0) {
+			if (id == -EAGAIN)
 				return -ENOMEM;
-			return n;
+			return id;
 		}
 
 	}

-- 
Cheers,
Stephen Rothwell

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