Re: [OS-BUILD PATCHv2] New configs in drivers/gpio

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On Tue, Oct 27, 2020 at 11:13:40PM -0000, GitLab Bridge on behalf of jeremycline wrote:
> From: Fedora Kernel Team <kernel-team@xxxxxxxxxxxxxxxxx>
> 
> Hi,
> 
> As part of the ongoing rebase effort, the following configuration
> options need to be reviewed.
> 
> As a reminder, the ARK configuration flow involves moving unreviewed
> configuration options from the pending directory to the ark directory.
> In the diff below, options are removed from the pending directory and
> added to the ark hierarchy. The final options that need to be ACKed
> are the files that are being added to the ark hierarchy.
> 
> If the value for a file that is added should be changed, please reply
> with a better option.
> 
>  CONFIG_GPIO_CDEV_V1:
> 
>  Say Y here to support version 1 of the GPIO CDEV ABI.
> 
>  This ABI version is deprecated.
>  Please use the latest ABI for new developments.
> 
>  If unsure, say Y.
> 
>  Symbol: GPIO_CDEV_V1 [=y]
>  Type  : bool
>  Defined at drivers/gpio/Kconfig:85
>    Prompt: Support GPIO ABI Version 1
>    Depends on: GPIOLIB [=y] && GPIO_CDEV [=y]
>    Location:
>      -> Device Drivers
>        -> GPIO Support (GPIOLIB [=y])
>          -> Character device (/dev/gpiochipN) support (GPIO_CDEV [=y])
> 
> Cc: Brian Masney <bmasney@xxxxxxxxxx>
> Cc: David Arcari <darcari@xxxxxxxxxx>
> ---
>  .../common/generic/CONFIG_GPIO_CDEV_V1        |  1 +
>  .../generic/CONFIG_GPIO_CDEV_V1               | 22 -------------------
>  2 files changed, 1 insertion(+), 22 deletions(-)
>  create mode 100644 redhat/configs/common/generic/CONFIG_GPIO_CDEV_V1
>  delete mode 100644 redhat/configs/pending-common/generic/CONFIG_GPIO_CDEV_V1
> 
> diff --git a/redhat/configs/common/generic/CONFIG_GPIO_CDEV_V1 b/redhat/configs/common/generic/CONFIG_GPIO_CDEV_V1
> new file mode 100644
> index 000000000000..2a4e60a576ae
> --- /dev/null
> +++ b/redhat/configs/common/generic/CONFIG_GPIO_CDEV_V1
> @@ -0,0 +1 @@
> +CONFIG_GPIO_CDEV_V1=y

I think we should disable this in ARK since there's some alignment
issues when running 32-bit apps on 64-bit kernels with the v1 ABI
that's described at [1]. libgpiod [2] has been updated to use the v2
ABI and will require a 5.10 kernel for the v2 ABI.

Leave it enabled in Fedora for now but we should consider disabling this
for Fedora 34.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b53911aa872d
[2] https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/

Brian
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