[PATCH][next] xen/pci: Avoid -Wflex-array-member-not-at-end warning

[PATCH][next] xen/pci: Avoid -Wflex-array-member-not-at-end warning

[Gustavo A. R. Silva]

Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
a flexible structure where the size of the flexible-array member
is known at compile-time, and refactor the rest of the code,
accordingly.

So, with this, fix the following warning:

drivers/xen/pci.c:48:55: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/xen/pci.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
index 72d4e3f193af..a2facd8f7e51 100644
--- a/drivers/xen/pci.c
+++ b/drivers/xen/pci.c
@@ -44,15 +44,11 @@ static int xen_add_device(struct device *dev)
 	}
 #endif
 	if (pci_seg_supported) {
-		struct {
-			struct physdev_pci_device_add add;
-			uint32_t pxm;
-		} add_ext = {
-			.add.seg = pci_domain_nr(pci_dev->bus),
-			.add.bus = pci_dev->bus->number,
-			.add.devfn = pci_dev->devfn
-		};
-		struct physdev_pci_device_add *add = &add_ext.add;
+		DEFINE_RAW_FLEX(struct physdev_pci_device_add, add, optarr, 1);
+
+		add->seg = pci_domain_nr(pci_dev->bus);
+		add->bus = pci_dev->bus->number;
+		add->devfn = pci_dev->devfn;
 
 #ifdef CONFIG_ACPI
 		acpi_handle handle;
-- 
2.34.1

Re: [PATCH][next] xen/pci: Avoid -Wflex-array-member-not-at-end warning

[Kees Cook]

On Tue, Aug 20, 2024 at 06:50:56PM -0600, Gustavo A. R. Silva wrote:
> Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
> a flexible structure where the size of the flexible-array member
> is known at compile-time, and refactor the rest of the code,
> accordingly.
> 
> So, with this, fix the following warning:
> 
> drivers/xen/pci.c:48:55: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
>  drivers/xen/pci.c | 14 +++++---------
>  1 file changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
> index 72d4e3f193af..a2facd8f7e51 100644
> --- a/drivers/xen/pci.c
> +++ b/drivers/xen/pci.c
> @@ -44,15 +44,11 @@ static int xen_add_device(struct device *dev)
>  	}
>  #endif
>  	if (pci_seg_supported) {
> -		struct {
> -			struct physdev_pci_device_add add;
> -			uint32_t pxm;
> -		} add_ext = {
> -			.add.seg = pci_domain_nr(pci_dev->bus),
> -			.add.bus = pci_dev->bus->number,
> -			.add.devfn = pci_dev->devfn
> -		};
> -		struct physdev_pci_device_add *add = &add_ext.add;
> +		DEFINE_RAW_FLEX(struct physdev_pci_device_add, add, optarr, 1);
> +
> +		add->seg = pci_domain_nr(pci_dev->bus);
> +		add->bus = pci_dev->bus->number;
> +		add->devfn = pci_dev->devfn;
>  
>  #ifdef CONFIG_ACPI
>  		acpi_handle handle;

Looks correct to me!

Reviewed-by: Kees Cook <kees@kernel.org>

-- 
Kees Cook

Re: [PATCH][next] xen/pci: Avoid -Wflex-array-member-not-at-end warning

[Gustavo A. R. Silva]

Hi all,

Friendly ping: who can take this, please? 🙂

Thanks
-- 
Gustavo

On 21/08/24 02:50, Gustavo A. R. Silva wrote:
> Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
> a flexible structure where the size of the flexible-array member
> is known at compile-time, and refactor the rest of the code,
> accordingly.
> 
> So, with this, fix the following warning:
> 
> drivers/xen/pci.c:48:55: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
>   drivers/xen/pci.c | 14 +++++---------
>   1 file changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
> index 72d4e3f193af..a2facd8f7e51 100644
> --- a/drivers/xen/pci.c
> +++ b/drivers/xen/pci.c
> @@ -44,15 +44,11 @@ static int xen_add_device(struct device *dev)
>   	}
>   #endif
>   	if (pci_seg_supported) {
> -		struct {
> -			struct physdev_pci_device_add add;
> -			uint32_t pxm;
> -		} add_ext = {
> -			.add.seg = pci_domain_nr(pci_dev->bus),
> -			.add.bus = pci_dev->bus->number,
> -			.add.devfn = pci_dev->devfn
> -		};
> -		struct physdev_pci_device_add *add = &add_ext.add;
> +		DEFINE_RAW_FLEX(struct physdev_pci_device_add, add, optarr, 1);
> +
> +		add->seg = pci_domain_nr(pci_dev->bus);
> +		add->bus = pci_dev->bus->number;
> +		add->devfn = pci_dev->devfn;
>   
>   #ifdef CONFIG_ACPI
>   		acpi_handle handle;

Re: [PATCH][next] xen/pci: Avoid -Wflex-array-member-not-at-end warning

[Jürgen Groß]

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On 13.09.24 10:07, Gustavo A. R. Silva wrote:
> Hi all,
> 
> Friendly ping: who can take this, please? 🙂

I can carry it via the Xen tree.


Juergen


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Re: [PATCH][next] xen/pci: Avoid -Wflex-array-member-not-at-end warning

[Gustavo A. R. Silva]

On 13/09/24 10:12, Jürgen Groß wrote:
> On 13.09.24 10:07, Gustavo A. R. Silva wrote:
>> Hi all,
>>
>> Friendly ping: who can take this, please? 🙂
> 
> I can carry it via the Xen tree.

Sounds good. :)

Thank you!
--
Gustavo