* [PATCH] mtd: rawnand: sunxi: Use struct_size() in devm_kzalloc()
@ 2019-01-04 17:26 ` Gustavo A. R. Silva
0 siblings, 0 replies; 6+ messages in thread
From: Gustavo A. R. Silva @ 2019-01-04 17:26 UTC (permalink / raw)
To: Boris Brezillon, Miquel Raynal, Richard Weinberger,
David Woodhouse, Brian Norris, Marek Vasut, Maxime Ripard,
Chen-Yu Tsai
Cc: linux-mtd, linux-arm-kernel, linux-kernel, Gustavo A. R. Silva
One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:
struct foo {
int stuff;
void *entry[];
};
instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);
Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:
instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);
This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
drivers/mtd/nand/raw/sunxi_nand.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c
index e828ee50a201..f66fffe663bf 100644
--- a/drivers/mtd/nand/raw/sunxi_nand.c
+++ b/drivers/mtd/nand/raw/sunxi_nand.c
@@ -1870,10 +1870,7 @@ static int sunxi_nand_chip_init(struct device *dev, struct sunxi_nfc *nfc,
return -EINVAL;
}
- chip = devm_kzalloc(dev,
- sizeof(*chip) +
- (nsels * sizeof(struct sunxi_nand_chip_sel)),
- GFP_KERNEL);
+ chip = devm_kzalloc(dev, struct_size(chip, sels, nsels), GFP_KERNEL);
if (!chip) {
dev_err(dev, "could not allocate chip\n");
return -ENOMEM;
--
2.20.1
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH] mtd: rawnand: sunxi: Use struct_size() in devm_kzalloc()
@ 2019-01-04 17:26 ` Gustavo A. R. Silva
0 siblings, 0 replies; 6+ messages in thread
From: Gustavo A. R. Silva @ 2019-01-04 17:26 UTC (permalink / raw)
To: Boris Brezillon, Miquel Raynal, Richard Weinberger,
David Woodhouse, Brian Norris, Marek Vasut, Maxime Ripard,
Chen-Yu Tsai
Cc: linux-mtd, linux-kernel, linux-arm-kernel, Gustavo A. R. Silva
One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:
struct foo {
int stuff;
void *entry[];
};
instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);
Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:
instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);
This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
drivers/mtd/nand/raw/sunxi_nand.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c
index e828ee50a201..f66fffe663bf 100644
--- a/drivers/mtd/nand/raw/sunxi_nand.c
+++ b/drivers/mtd/nand/raw/sunxi_nand.c
@@ -1870,10 +1870,7 @@ static int sunxi_nand_chip_init(struct device *dev, struct sunxi_nfc *nfc,
return -EINVAL;
}
- chip = devm_kzalloc(dev,
- sizeof(*chip) +
- (nsels * sizeof(struct sunxi_nand_chip_sel)),
- GFP_KERNEL);
+ chip = devm_kzalloc(dev, struct_size(chip, sels, nsels), GFP_KERNEL);
if (!chip) {
dev_err(dev, "could not allocate chip\n");
return -ENOMEM;
--
2.20.1
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^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH] mtd: rawnand: sunxi: Use struct_size() in devm_kzalloc()
2019-01-04 17:26 ` Gustavo A. R. Silva
@ 2019-01-04 18:14 ` Boris Brezillon
-1 siblings, 0 replies; 6+ messages in thread
From: Boris Brezillon @ 2019-01-04 18:14 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Miquel Raynal, Richard Weinberger, David Woodhouse, Brian Norris,
Marek Vasut, Maxime Ripard, Chen-Yu Tsai, linux-mtd, linux-kernel,
linux-arm-kernel
Hi Gustavo,
On Fri, 4 Jan 2019 11:26:37 -0600
"Gustavo A. R. Silva" <gustavo@embeddedor.com> wrote:
> One of the more common cases of allocation size calculations is finding
> the size of a structure that has a zero-sized array at the end, along
> with memory for some number of elements for that array. For example:
>
> struct foo {
> int stuff;
> void *entry[];
> };
>
> instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);
>
> Instead of leaving these open-coded and prone to type mistakes, we can
> now use the new struct_size() helper:
>
> instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);
>
> This code was detected with the help of Coccinelle.
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
> ---
> drivers/mtd/nand/raw/sunxi_nand.c | 5 +----
> 1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c
> index e828ee50a201..f66fffe663bf 100644
> --- a/drivers/mtd/nand/raw/sunxi_nand.c
> +++ b/drivers/mtd/nand/raw/sunxi_nand.c
> @@ -1870,10 +1870,7 @@ static int sunxi_nand_chip_init(struct device *dev, struct sunxi_nfc *nfc,
> return -EINVAL;
> }
>
> - chip = devm_kzalloc(dev,
> - sizeof(*chip) +
> - (nsels * sizeof(struct sunxi_nand_chip_sel)),
> - GFP_KERNEL);
> + chip = devm_kzalloc(dev, struct_size(chip, sels, nsels), GFP_KERNEL);
> if (!chip) {
> dev_err(dev, "could not allocate chip\n");
> return -ENOMEM;
I posted the same patch a few days back [1].
[1]http://patchwork.ozlabs.org/patch/1013855/
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] mtd: rawnand: sunxi: Use struct_size() in devm_kzalloc()
@ 2019-01-04 18:14 ` Boris Brezillon
0 siblings, 0 replies; 6+ messages in thread
From: Boris Brezillon @ 2019-01-04 18:14 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Maxime Ripard, Richard Weinberger, linux-kernel, Marek Vasut,
Chen-Yu Tsai, linux-mtd, Miquel Raynal, Brian Norris,
David Woodhouse, linux-arm-kernel
Hi Gustavo,
On Fri, 4 Jan 2019 11:26:37 -0600
"Gustavo A. R. Silva" <gustavo@embeddedor.com> wrote:
> One of the more common cases of allocation size calculations is finding
> the size of a structure that has a zero-sized array at the end, along
> with memory for some number of elements for that array. For example:
>
> struct foo {
> int stuff;
> void *entry[];
> };
>
> instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);
>
> Instead of leaving these open-coded and prone to type mistakes, we can
> now use the new struct_size() helper:
>
> instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);
>
> This code was detected with the help of Coccinelle.
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
> ---
> drivers/mtd/nand/raw/sunxi_nand.c | 5 +----
> 1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c
> index e828ee50a201..f66fffe663bf 100644
> --- a/drivers/mtd/nand/raw/sunxi_nand.c
> +++ b/drivers/mtd/nand/raw/sunxi_nand.c
> @@ -1870,10 +1870,7 @@ static int sunxi_nand_chip_init(struct device *dev, struct sunxi_nfc *nfc,
> return -EINVAL;
> }
>
> - chip = devm_kzalloc(dev,
> - sizeof(*chip) +
> - (nsels * sizeof(struct sunxi_nand_chip_sel)),
> - GFP_KERNEL);
> + chip = devm_kzalloc(dev, struct_size(chip, sels, nsels), GFP_KERNEL);
> if (!chip) {
> dev_err(dev, "could not allocate chip\n");
> return -ENOMEM;
I posted the same patch a few days back [1].
[1]http://patchwork.ozlabs.org/patch/1013855/
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] mtd: rawnand: sunxi: Use struct_size() in devm_kzalloc()
2019-01-04 18:14 ` Boris Brezillon
@ 2019-01-04 18:22 ` Gustavo A. R. Silva
-1 siblings, 0 replies; 6+ messages in thread
From: Gustavo A. R. Silva @ 2019-01-04 18:22 UTC (permalink / raw)
To: Boris Brezillon
Cc: Miquel Raynal, Richard Weinberger, David Woodhouse, Brian Norris,
Marek Vasut, Maxime Ripard, Chen-Yu Tsai, linux-mtd, linux-kernel,
linux-arm-kernel
Hey Boris,
On 1/4/19 12:14 PM, Boris Brezillon wrote:
>
> I posted the same patch a few days back [1].
>
> [1]http://patchwork.ozlabs.org/patch/1013855/
>
Oh, that's great.
It's good to see people adopting the struct_size helper. :)
Happy new year.
Thanks
--
Gustavo
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] mtd: rawnand: sunxi: Use struct_size() in devm_kzalloc()
@ 2019-01-04 18:22 ` Gustavo A. R. Silva
0 siblings, 0 replies; 6+ messages in thread
From: Gustavo A. R. Silva @ 2019-01-04 18:22 UTC (permalink / raw)
To: Boris Brezillon
Cc: Maxime Ripard, Richard Weinberger, linux-kernel, Marek Vasut,
Chen-Yu Tsai, linux-mtd, Miquel Raynal, Brian Norris,
David Woodhouse, linux-arm-kernel
Hey Boris,
On 1/4/19 12:14 PM, Boris Brezillon wrote:
>
> I posted the same patch a few days back [1].
>
> [1]http://patchwork.ozlabs.org/patch/1013855/
>
Oh, that's great.
It's good to see people adopting the struct_size helper. :)
Happy new year.
Thanks
--
Gustavo
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2019-01-04 18:23 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2019-01-04 17:26 [PATCH] mtd: rawnand: sunxi: Use struct_size() in devm_kzalloc() Gustavo A. R. Silva
2019-01-04 17:26 ` Gustavo A. R. Silva
2019-01-04 18:14 ` Boris Brezillon
2019-01-04 18:14 ` Boris Brezillon
2019-01-04 18:22 ` Gustavo A. R. Silva
2019-01-04 18:22 ` Gustavo A. R. Silva
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