linux-kernel - Re: [PATCH] uio: make MAX_UIO_MAPS & MAX_UIO_PORT

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Date:   Wed, 13 Apr 2022 09:27:57 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Ramon Fried <rfried.dev@...il.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] uio: make MAX_UIO_MAPS & MAX_UIO_PORT_REGIONS
 configurable

On Wed, Apr 13, 2022 at 10:11:37AM +0300, Ramon Fried wrote:
> MAX_UIO_MAPS and MAX_UIO_PORT_REGIONS are hard-coded to 5.
> This is not always sufficiant for some drivers.

Why not?  What in-kernel drivers need more than this?

> Make the MAX_UIO_MAPS and MAX_UIO_PORT_REGIONS configurable by
> providing Kconfig int option with the defaut value of 5.

Spelling check?

> 
> Signed-off-by: Ramon Fried <rfried.dev@...il.com>
> ---
>  drivers/uio/Kconfig        | 14 ++++++++++++++
>  include/linux/uio_driver.h |  4 ++--
>  2 files changed, 16 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
> index 2e16c5338e5b..bc1fe83cec13 100644
> --- a/drivers/uio/Kconfig
> +++ b/drivers/uio/Kconfig
> @@ -13,6 +13,20 @@ menuconfig UIO
>  
>  if UIO
>  
> +config UIO_MAX_MAPS
> +	int "Maximum of memory nodes each uio device support(1-128)"

Space before "(" please.

> +	range 1 128
> +	default 5
> +	help
> +	  Maximum memory mapping each uio device can support.

Any hints as to what this means in more detail?

> +
> +config UIO_MAX_PORT_REGIONS
> +	int "Maximum of port regions each uio device support(1-128)"
> +	range 1 128
> +	default 5
> +	help
> +	  Maximum port regions each uio device can support.

Again more detail please.

thanks,

greg k-h