linux-kernel - [PATCH] crypto: user - fix potential warnings in cryptouser.h

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Date:   Sun,  9 Jun 2019 15:57:10 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        linux-crypto@...r.kernel.org
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org, Eric Biggers <ebiggers@...gle.com>,
        Corentin Labbe <clabbe@...libre.com>
Subject: [PATCH] crypto: user - fix potential warnings in cryptouser.h

Function definitions in headers are usually marked as 'static inline'.

Since 'inline' is missing for crypto_reportstat(), if it were not
referenced from a .c file that includes this header, it would produce
a warning.

Also, 'struct crypto_user_alg' should be forward declared so that
we do not rely on the specific order of header inclusion.

Detected by compile-testing cryptouser.h as a standalone unit:

/include/crypto/internal/cryptouser.h:6:44: warning: ‘struct crypto_user_alg’ declared inside parameter list will not be visible outside of this definition or declaration
 struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact);
                                            ^~~~~~~~~~~~~~~
./include/crypto/internal/cryptouser.h:11:12: warning: ‘crypto_reportstat’ defined but not used [-Wunused-function]
 static int crypto_reportstat(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, struct nlattr **attrs)
            ^~~~~~~~~~~~~~~~~

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

 include/crypto/internal/cryptouser.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/crypto/internal/cryptouser.h b/include/crypto/internal/cryptouser.h
index 8c602b187c58..2339cb06dbf8 100644
--- a/include/crypto/internal/cryptouser.h
+++ b/include/crypto/internal/cryptouser.h
@@ -3,12 +3,15 @@
 
 extern struct sock *crypto_nlsk;
 
+struct crypto_user_alg;
 struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact);
 
 #ifdef CONFIG_CRYPTO_STATS
 int crypto_reportstat(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, struct nlattr **attrs);
 #else
-static int crypto_reportstat(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, struct nlattr **attrs)
+static inline int crypto_reportstat(struct sk_buff *in_skb,
+				    struct nlmsghdr *in_nlh,
+				    struct nlattr **attrs)
 {
 	return -ENOTSUPP;
 }
-- 
2.17.1