* [PATCH] gpio: uniphier: Replace zero-length array with flexible-array member
@ 2020-02-11 21:06 ` Gustavo A. R. Silva
0 siblings, 0 replies; 6+ messages in thread
From: Gustavo A. R. Silva @ 2020-02-11 21:06 UTC (permalink / raw)
To: Linus Walleij, Bartosz Golaszewski, Masahiro Yamada
Cc: linux-gpio, linux-arm-kernel, linux-kernel, Gustavo A. R. Silva
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertenly introduced[3] to the codebase from now on.
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
drivers/gpio/gpio-uniphier.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpio/gpio-uniphier.c b/drivers/gpio/gpio-uniphier.c
index 0f662b297a95..9843638d99d0 100644
--- a/drivers/gpio/gpio-uniphier.c
+++ b/drivers/gpio/gpio-uniphier.c
@@ -33,7 +33,7 @@ struct uniphier_gpio_priv {
struct irq_domain *domain;
void __iomem *regs;
spinlock_t lock;
- u32 saved_vals[0];
+ u32 saved_vals[];
};
static unsigned int uniphier_gpio_bank_to_reg(unsigned int bank)
--
2.25.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH] gpio: uniphier: Replace zero-length array with flexible-array member
@ 2020-02-11 21:06 ` Gustavo A. R. Silva
0 siblings, 0 replies; 6+ messages in thread
From: Gustavo A. R. Silva @ 2020-02-11 21:06 UTC (permalink / raw)
To: Linus Walleij, Bartosz Golaszewski, Masahiro Yamada
Cc: linux-gpio, linux-kernel, linux-arm-kernel, Gustavo A. R. Silva
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertenly introduced[3] to the codebase from now on.
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
drivers/gpio/gpio-uniphier.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpio/gpio-uniphier.c b/drivers/gpio/gpio-uniphier.c
index 0f662b297a95..9843638d99d0 100644
--- a/drivers/gpio/gpio-uniphier.c
+++ b/drivers/gpio/gpio-uniphier.c
@@ -33,7 +33,7 @@ struct uniphier_gpio_priv {
struct irq_domain *domain;
void __iomem *regs;
spinlock_t lock;
- u32 saved_vals[0];
+ u32 saved_vals[];
};
static unsigned int uniphier_gpio_bank_to_reg(unsigned int bank)
--
2.25.0
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] gpio: uniphier: Replace zero-length array with flexible-array member
2020-02-11 21:06 ` Gustavo A. R. Silva
@ 2020-02-17 9:38 ` Bartosz Golaszewski
-1 siblings, 0 replies; 6+ messages in thread
From: Bartosz Golaszewski @ 2020-02-17 9:38 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Linus Walleij, Masahiro Yamada, linux-gpio, arm-soc, LKML
wt., 11 lut 2020 o 22:03 Gustavo A. R. Silva <gustavo@embeddedor.com>
napisał(a):
>
> The current codebase makes use of the zero-length array language
> extension to the C90 standard, but the preferred mechanism to declare
> variable-length types such as these ones is a flexible array member[1][2],
> introduced in C99:
>
> struct foo {
> int stuff;
> struct boo array[];
> };
>
> By making use of the mechanism above, we will get a compiler warning
> in case the flexible array does not occur last in the structure, which
> will help us prevent some kind of undefined behavior bugs from being
> inadvertenly introduced[3] to the codebase from now on.
>
> This issue was found with the help of Coccinelle.
>
> [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
> [2] https://github.com/KSPP/linux/issues/21
> [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Patch applied, thanks!
Bartosz
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] gpio: uniphier: Replace zero-length array with flexible-array member
@ 2020-02-17 9:38 ` Bartosz Golaszewski
0 siblings, 0 replies; 6+ messages in thread
From: Bartosz Golaszewski @ 2020-02-17 9:38 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Masahiro Yamada, Linus Walleij, LKML, arm-soc, linux-gpio
wt., 11 lut 2020 o 22:03 Gustavo A. R. Silva <gustavo@embeddedor.com>
napisał(a):
>
> The current codebase makes use of the zero-length array language
> extension to the C90 standard, but the preferred mechanism to declare
> variable-length types such as these ones is a flexible array member[1][2],
> introduced in C99:
>
> struct foo {
> int stuff;
> struct boo array[];
> };
>
> By making use of the mechanism above, we will get a compiler warning
> in case the flexible array does not occur last in the structure, which
> will help us prevent some kind of undefined behavior bugs from being
> inadvertenly introduced[3] to the codebase from now on.
>
> This issue was found with the help of Coccinelle.
>
> [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
> [2] https://github.com/KSPP/linux/issues/21
> [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Patch applied, thanks!
Bartosz
_______________________________________________
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] gpio: uniphier: Replace zero-length array with flexible-array member
2020-02-11 21:06 ` Gustavo A. R. Silva
@ 2020-02-18 1:25 ` Masahiro Yamada
-1 siblings, 0 replies; 6+ messages in thread
From: Masahiro Yamada @ 2020-02-18 1:25 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Linus Walleij, Bartosz Golaszewski, open list:GPIO SUBSYSTEM,
linux-arm-kernel, Linux Kernel Mailing List
On Wed, Feb 12, 2020 at 6:03 AM Gustavo A. R. Silva
<gustavo@embeddedor.com> wrote:
>
> The current codebase makes use of the zero-length array language
> extension to the C90 standard, but the preferred mechanism to declare
> variable-length types such as these ones is a flexible array member[1][2],
> introduced in C99:
>
> struct foo {
> int stuff;
> struct boo array[];
> };
>
> By making use of the mechanism above, we will get a compiler warning
> in case the flexible array does not occur last in the structure, which
> will help us prevent some kind of undefined behavior bugs from being
> inadvertenly introduced[3] to the codebase from now on.
>
> This issue was found with the help of Coccinelle.
>
> [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
> [2] https://github.com/KSPP/linux/issues/21
> [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> ---
> drivers/gpio/gpio-uniphier.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/gpio-uniphier.c b/drivers/gpio/gpio-uniphier.c
> index 0f662b297a95..9843638d99d0 100644
> --- a/drivers/gpio/gpio-uniphier.c
> +++ b/drivers/gpio/gpio-uniphier.c
> @@ -33,7 +33,7 @@ struct uniphier_gpio_priv {
> struct irq_domain *domain;
> void __iomem *regs;
> spinlock_t lock;
> - u32 saved_vals[0];
> + u32 saved_vals[];
> };
>
> static unsigned int uniphier_gpio_bank_to_reg(unsigned int bank)
> --
> 2.25.0
>
--
Best Regards
Masahiro Yamada
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] gpio: uniphier: Replace zero-length array with flexible-array member
@ 2020-02-18 1:25 ` Masahiro Yamada
0 siblings, 0 replies; 6+ messages in thread
From: Masahiro Yamada @ 2020-02-18 1:25 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Bartosz Golaszewski, Linus Walleij, Linux Kernel Mailing List,
linux-arm-kernel, open list:GPIO SUBSYSTEM
On Wed, Feb 12, 2020 at 6:03 AM Gustavo A. R. Silva
<gustavo@embeddedor.com> wrote:
>
> The current codebase makes use of the zero-length array language
> extension to the C90 standard, but the preferred mechanism to declare
> variable-length types such as these ones is a flexible array member[1][2],
> introduced in C99:
>
> struct foo {
> int stuff;
> struct boo array[];
> };
>
> By making use of the mechanism above, we will get a compiler warning
> in case the flexible array does not occur last in the structure, which
> will help us prevent some kind of undefined behavior bugs from being
> inadvertenly introduced[3] to the codebase from now on.
>
> This issue was found with the help of Coccinelle.
>
> [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
> [2] https://github.com/KSPP/linux/issues/21
> [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> ---
> drivers/gpio/gpio-uniphier.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/gpio-uniphier.c b/drivers/gpio/gpio-uniphier.c
> index 0f662b297a95..9843638d99d0 100644
> --- a/drivers/gpio/gpio-uniphier.c
> +++ b/drivers/gpio/gpio-uniphier.c
> @@ -33,7 +33,7 @@ struct uniphier_gpio_priv {
> struct irq_domain *domain;
> void __iomem *regs;
> spinlock_t lock;
> - u32 saved_vals[0];
> + u32 saved_vals[];
> };
>
> static unsigned int uniphier_gpio_bank_to_reg(unsigned int bank)
> --
> 2.25.0
>
--
Best Regards
Masahiro Yamada
_______________________________________________
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:[~2020-02-18 1:26 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2020-02-11 21:06 [PATCH] gpio: uniphier: Replace zero-length array with flexible-array member Gustavo A. R. Silva
2020-02-11 21:06 ` Gustavo A. R. Silva
2020-02-17 9:38 ` Bartosz Golaszewski
2020-02-17 9:38 ` Bartosz Golaszewski
2020-02-18 1:25 ` Masahiro Yamada
2020-02-18 1:25 ` Masahiro Yamada
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