* [PATCH 2/2] drivers/dma: drop unnecesary memset
@ 2009-12-19 7:30 Julia Lawall
2009-12-23 15:08 ` Sosnowski, Maciej
0 siblings, 1 reply; 2+ messages in thread
From: Julia Lawall @ 2009-12-19 7:30 UTC (permalink / raw)
To: Dan Williams, Maciej Sosnowski, linux-kernel, kernel-janitors
From: Julia Lawall <julia@diku.dk>
memset of 0 is not needed after kzalloc
The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@@
expression x;
statement S;
@@
x = kzalloc(...);
if (x == NULL) S
... when != x
-memset(x,0,...);// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
---
drivers/dma/dw_dmac.c | 2 --
1 file changed, 2 deletions(-)
diff -u -p a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -1270,8 +1270,6 @@ static int __init dw_probe(struct platfo
goto err_kfree;
}
- memset(dw, 0, sizeof *dw);
-
dw->regs = ioremap(io->start, DW_REGLEN);
if (!dw->regs) {
err = -ENOMEM;
^ permalink raw reply [flat|nested] 2+ messages in thread
* RE: [PATCH 2/2] drivers/dma: drop unnecesary memset
2009-12-19 7:30 [PATCH 2/2] drivers/dma: drop unnecesary memset Julia Lawall
@ 2009-12-23 15:08 ` Sosnowski, Maciej
0 siblings, 0 replies; 2+ messages in thread
From: Sosnowski, Maciej @ 2009-12-23 15:08 UTC (permalink / raw)
To: Julia Lawall; +Cc: Williams, Dan J, linux-kernel, kernel-janitors
Julia Lawall wrote:
> From: Julia Lawall <julia@diku.dk>
>
> memset of 0 is not needed after kzalloc
>
> The semantic patch that makes this change is as follows:
> (http://coccinelle.lip6.fr/)
>
> // <smpl>
> @@
> expression x;
> statement S;
> @@
>
> x = kzalloc(...);
> if (x == NULL) S
> ... when != x
> -memset(x,0,...);// </smpl>
>
> Signed-off-by: Julia Lawall <julia@diku.dk>
>
> ---
> drivers/dma/dw_dmac.c | 2 --
> 1 file changed, 2 deletions(-)
>
> diff -u -p a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
> --- a/drivers/dma/dw_dmac.c
> +++ b/drivers/dma/dw_dmac.c
> @@ -1270,8 +1270,6 @@ static int __init dw_probe(struct platfo
> goto err_kfree;
> }
>
> - memset(dw, 0, sizeof *dw);
> -
> dw->regs = ioremap(io->start, DW_REGLEN);
> if (!dw->regs) {
> err = -ENOMEM;
Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
^ permalink raw reply [flat|nested] 2+ messages in thread
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