linux-kernel - Re: [PATCH v2 2/3] iio: industrialio-backend: support backend capabilities

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <aWaz2JrwtwwE3dEc@smile.fi.intel.com>
Date: Tue, 13 Jan 2026 23:06:32 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Tomas Melin <tomas.melin@...sala.com>
Cc: Michael Hennerich <Michael.Hennerich@...log.com>,
	Nuno Sa <nuno.sa@...log.com>, Lars-Peter Clausen <lars@...afoo.de>,
	Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Andy Shevchenko <andy@...nel.org>,
	Olivier Moysan <olivier.moysan@...s.st.com>,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] iio: industrialio-backend: support backend
 capabilities

On Tue, Jan 13, 2026 at 12:12:48PM +0000, Tomas Melin wrote:
> Not all backends support the full set of capabilities provided by the
> industrialio-backend framework. Capability bits can be used in frontends
> and backends for checking for a certain feature set, or if using
> related functions can be expected to fail.
> 
> Capability bits should be set by a compatible backend and provided when
> registering the backend.

...

> struct iio_backend {

>  	u8 idx;
> +	u32 caps;

Please, run `pahole` to see if there is a better place for a new member.
(I bet there is.)

>  };

...

> +enum iio_backend_capabilities {
> +	IIO_BACKEND_CAP_TEST_PATTERNS = BIT(0),
> +	IIO_BACKEND_CAP_BUFFERING = BIT(1),
> +	IIO_BACKEND_CAP_CALIBRATION = BIT(2)

Add trailing comma, it will allow to avoid unneeded churn in the future.

> +};


-- 
With Best Regards,
Andy Shevchenko