linux-kernel - [PATCH 08/14] xprtrdma: drop double zeroing

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Date:   Sun, 20 Sep 2020 13:26:20 +0200
From:   Julia Lawall <Julia.Lawall@...ia.fr>
To:     "J. Bruce Fields" <bfields@...ldses.org>
Cc:     kernel-janitors@...r.kernel.org,
        Chuck Lever <chuck.lever@...cle.com>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-nfs@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 08/14] xprtrdma: drop double zeroing

sg_init_table zeroes its first argument, so the allocation of that argument
doesn't have to.

the semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x,n,flags;
@@

x = 
- kcalloc
+ kmalloc_array
  (n,sizeof(*x),flags)
...
sg_init_table(x,n)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...ia.fr>

---
 net/sunrpc/xprtrdma/frwr_ops.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
--- a/net/sunrpc/xprtrdma/frwr_ops.c
+++ b/net/sunrpc/xprtrdma/frwr_ops.c
@@ -124,7 +124,7 @@ int frwr_mr_init(struct rpcrdma_xprt *r_
 	if (IS_ERR(frmr))
 		goto out_mr_err;
 
-	sg = kcalloc(depth, sizeof(*sg), GFP_NOFS);
+	sg = kmalloc_array(depth, sizeof(*sg), GFP_NOFS);
 	if (!sg)
 		goto out_list_err;