linux-kernel - [PATCH 14/14] PCI/P2PDMA: drop double zeroing

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Date:   Sun, 20 Sep 2020 13:26:26 +0200
From:   Julia Lawall <Julia.Lawall@...ia.fr>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     kernel-janitors@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 14/14] PCI/P2PDMA: 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;
@@

x =
- kzalloc
+ kmalloc
 (...)
...
sg_init_table(x,...)
// </smpl>

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

---
 drivers/pci/p2pdma.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
--- a/drivers/pci/p2pdma.c
+++ b/drivers/pci/p2pdma.c
@@ -762,7 +762,7 @@ struct scatterlist *pci_p2pmem_alloc_sgl
 	struct scatterlist *sg;
 	void *addr;
 
-	sg = kzalloc(sizeof(*sg), GFP_KERNEL);
+	sg = kmalloc(sizeof(*sg), GFP_KERNEL);
 	if (!sg)
 		return NULL;