linux-kernel - [PATCH 03/14] dpaa2-eth: drop double zeroing

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Message-Id: <1600601186-7420-4-git-send-email-Julia.Lawall@inria.fr>
Date:   Sun, 20 Sep 2020 13:26:15 +0200
From:   Julia Lawall <Julia.Lawall@...ia.fr>
To:     Ioana Ciornei <ioana.ciornei@....com>
Cc:     kernel-janitors@...r.kernel.org,
        Ioana Radulescu <ruxandra.radulescu@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 03/14] dpaa2-eth: 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(struct scatterlist),flags)
...
sg_init_table(x,n)
// </smpl>

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

---
 drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
@@ -607,7 +607,7 @@ static int dpaa2_eth_build_sg_fd(struct
 	if (unlikely(PAGE_SIZE / sizeof(struct scatterlist) < nr_frags + 1))
 		return -EINVAL;
 
-	scl = kcalloc(nr_frags + 1, sizeof(struct scatterlist), GFP_ATOMIC);
+	scl = kmalloc_array(nr_frags + 1, sizeof(struct scatterlist), GFP_ATOMIC);
 	if (unlikely(!scl))
 		return -ENOMEM;