linux-kernel - [PATCH 05/14] RDMA/efa: drop double zeroing

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Message-Id: <1600601186-7420-6-git-send-email-Julia.Lawall@inria.fr>
Date:   Sun, 20 Sep 2020 13:26:17 +0200
From:   Julia Lawall <Julia.Lawall@...ia.fr>
To:     Gal Pressman <galpress@...zon.com>
Cc:     kernel-janitors@...r.kernel.org,
        Yossi Leybovich <sleybo@...zon.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 05/14] RDMA/efa: 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>

---
 drivers/infiniband/hw/efa/efa_verbs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/drivers/infiniband/hw/efa/efa_verbs.c b/drivers/infiniband/hw/efa/efa_verbs.c
--- a/drivers/infiniband/hw/efa/efa_verbs.c
+++ b/drivers/infiniband/hw/efa/efa_verbs.c
@@ -1157,7 +1157,7 @@ static struct scatterlist *efa_vmalloc_b
 	struct page *pg;
 	int i;
 
-	sglist = kcalloc(page_cnt, sizeof(*sglist), GFP_KERNEL);
+	sglist = kmalloc_array(page_cnt, sizeof(*sglist), GFP_KERNEL);
 	if (!sglist)
 		return NULL;
 	sg_init_table(sglist, page_cnt);