linux-kernel - [PATCH v2] iov_iter: Fix build error without CONFIG

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Date:   Thu, 4 Apr 2019 10:39:13 +0800
From:   Yue Haibing <yuehaibing@...wei.com>
To:     <davem@...emloft.net>, <viro@...iv.linux.org.uk>,
        <willemb@...gle.com>, <edumazet@...gle.com>, <fw@...len.de>,
        <sagi@...htbitslabs.com>, <hch@....de>, <pabeni@...hat.com>,
        <pctammela@...il.com>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH v2] iov_iter: Fix build error without CONFIG_CRYPTO

From: YueHaibing <yuehaibing@...wei.com>

If CONFIG_CRYPTO is not set or set to m,
gcc building warn this:

lib/iov_iter.o: In function `hash_and_copy_to_iter':
iov_iter.c:(.text+0x9129): undefined reference to `crypto_stats_get'
iov_iter.c:(.text+0x9152): undefined reference to `crypto_stats_ahash_update'

Reported-by: Hulk Robot <hulkci@...wei.com>
Fixes: d05f443554b3 ("iov_iter: introduce hash_and_copy_to_iter helper")
Suggested-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
v2: rework the fix as Al Viro suggested
---
 lib/iov_iter.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 50e77ec..f74fa83 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1531,6 +1531,7 @@ EXPORT_SYMBOL(csum_and_copy_to_iter);
 size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp,
 		struct iov_iter *i)
 {
+#ifdef CONFIG_CRYPTO
 	struct ahash_request *hash = hashp;
 	struct scatterlist sg;
 	size_t copied;
@@ -1540,6 +1541,9 @@ size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp,
 	ahash_request_set_crypt(hash, &sg, NULL, copied);
 	crypto_ahash_update(hash);
 	return copied;
+#else
+	return 0;
+#endif
 }
 EXPORT_SYMBOL(hash_and_copy_to_iter);
 
-- 
2.7.4