linux-kernel - [PATCH] net: drop_monitor: use IS_REACHABLE() to guard net_dm_hw

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Date:   Wed, 11 Mar 2020 15:29:25 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Neil Horman <nhorman@...driver.com>, netdev@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>
Cc:     Ido Schimmel <idosch@...lanox.com>, Jiri Pirko <jiri@...lanox.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Nicolas Pitre <nico@...xnic.net>, linux-kbuild@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] net: drop_monitor: use IS_REACHABLE() to guard net_dm_hw_report()

In net/Kconfig, NET_DEVLINK implies NET_DROP_MONITOR.

The original behavior of the 'imply' keyword prevents NET_DROP_MONITOR
from being 'm' when NET_DEVLINK=y.

With the planned Kconfig change that relaxes the 'imply', the
combination of NET_DEVLINK=y and NET_DROP_MONITOR=m would be allowed.

Use IS_REACHABLE() to avoid the vmlinux link error for this case.

Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

This build error was reported in linux-next.
https://lkml.org/lkml/2020/3/10/1936

If this patch is acceptable,
I'd like to get Ack from the maintainers,
and insert this patch before my Kconfig change.

 include/net/drop_monitor.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/drop_monitor.h b/include/net/drop_monitor.h
index 2ab668461463..f68bc373544a 100644
--- a/include/net/drop_monitor.h
+++ b/include/net/drop_monitor.h
@@ -19,7 +19,7 @@ struct net_dm_hw_metadata {
 	struct net_device *input_dev;
 };

-#if IS_ENABLED(CONFIG_NET_DROP_MONITOR)
+#if IS_REACHABLE(CONFIG_NET_DROP_MONITOR)
 void net_dm_hw_report(struct sk_buff *skb,
 		      const struct net_dm_hw_metadata *hw_metadata);
 #else
-- 
2.17.1