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From:   Fuqian Huang <huangfq.daxian@gmail.com>
Cc:     "J . Bruce Fields" <bfields@fieldses.org>,
        Chuck Lever <chuck.lever@oracle.com>,
        linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org,
        Fuqian Huang <huangfq.daxian@gmail.com>
Subject: [PATCH v2 29/35] nfsd: Use kmemdup rather than duplicating its implementation
Date:   Thu,  4 Jul 2019 00:31:26 +0800
Message-Id: <20190703163126.761-1-huangfq.daxian@gmail.com>
To:     unlisted-recipients:; (no To-header on input)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

kmemdup is introduced to duplicate a region of memory in a neat way.
Rather than kmalloc/kzalloc + memcpy, which the programmer needs to
write the size twice (sometimes lead to mistakes), kmemdup improves
readability, leads to smaller code and also reduce the chances of mistakes.
Suggestion to use kmemdup rather than using kmalloc/kzalloc + memcpy.

Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
---
Changes in v2:
  - Fix a typo in commit message (memset -> memcpy)

 fs/nfsd/nfscache.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index da52b594362a..c0226f0281af 100644
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -533,13 +533,12 @@ nfsd_cache_update(struct svc_rqst *rqstp, int cachetype, __be32 *statp)
 	case RC_REPLBUFF:
 		cachv = &rp->c_replvec;
 		bufsize = len << 2;
-		cachv->iov_base = kmalloc(bufsize, GFP_KERNEL);
+		cachv->iov_base = kmemdup(statp, bufsize, GFP_KERNEL);
 		if (!cachv->iov_base) {
 			nfsd_reply_cache_free(b, rp);
 			return;
 		}
 		cachv->iov_len = bufsize;
-		memcpy(cachv->iov_base, statp, bufsize);
 		break;
 	case RC_NOCACHE:
 		nfsd_reply_cache_free(b, rp);
-- 
2.11.0