From: Kent Gibson <warthog618@gmail.com>
To: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
LKML <linux-kernel@vger.kernel.org>,
linux-gpio <linux-gpio@vger.kernel.org>,
Linus Walleij <linus.walleij@linaro.org>
Subject: Re: [PATCH v3 02/18] gpio: uapi: define uAPI v2
Date: Wed, 12 Aug 2020 09:54:58 +0800 [thread overview]
Message-ID: <20200812015458.GA8760@sol> (raw)
In-Reply-To: <CAMpxmJWe6Cjhwt3izuPLK-Xzvm=LqOy_nnZ7xg123+M_JgriLw@mail.gmail.com>
On Tue, Aug 11, 2020 at 09:11:41PM +0200, Bartosz Golaszewski wrote:
> On Sun, Aug 9, 2020 at 3:26 PM Kent Gibson <warthog618@gmail.com> wrote:
> >
[snip]
> >
> > +/*
> > + * Maximum number of requested lines.
> > + *
> > + * Must be no greater than 64 as bitmaps are limited to 64-bits, and a
> > + * multiple of 2 to ensure 32/64-bit alignment of structs.
> > + */
> > +#define GPIO_V2_LINES_MAX 64
> > +
>
> If we refer to bitmaps for which helpers are defined in
> include/linux/bitmap.h then they're not limited to 64-bits. I'd just
> say here that we want to fit into 64-bit integers for simplicity.
>
Strictly speaking, userspace doesn't know about include/linux/bitmap.h,
but I'm happy to remove any ambiguity.
Does this work for you?:
* Must be no greater than 64, as bitmaps are restricted here to 64-bits
* for simplicity, and a multiple of 2 to ensure 32/64-bit alignment of
* structs.
Cheers,
Kent.
next prev parent reply other threads:[~2020-08-12 1:55 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-09 13:25 [PATCH v3 00/18] gpio: cdev: add uAPI v2 Kent Gibson
2020-08-09 13:25 ` [PATCH v3 01/18] gpio: uapi: define GPIO_MAX_NAME_SIZE for array sizes Kent Gibson
2020-08-09 13:25 ` [PATCH v3 02/18] gpio: uapi: define uAPI v2 Kent Gibson
2020-08-11 19:11 ` Bartosz Golaszewski
2020-08-12 1:54 ` Kent Gibson [this message]
2020-08-12 17:48 ` Bartosz Golaszewski
2020-08-09 13:25 ` [PATCH v3 03/18] gpiolib: make cdev a build option Kent Gibson
2020-08-09 13:25 ` [PATCH v3 04/18] gpiolib: add build option for CDEV v1 ABI Kent Gibson
2020-08-09 13:25 ` [PATCH v3 05/18] gpiolib: cdev: support GPIO_V2_GET_LINE_IOCTL and GPIO_V2_LINE_GET_VALUES_IOCTL Kent Gibson
2020-08-11 1:56 ` Kent Gibson
2020-08-09 13:25 ` [PATCH v3 06/18] gpiolib: cdev: support GPIO_V2_GET_LINEINFO_IOCTL and GPIO_V2_GET_LINEINFO_WATCH_IOCTL Kent Gibson
2020-08-12 5:29 ` Kent Gibson
2020-08-09 13:25 ` [PATCH v3 07/18] gpiolib: cdev: support edge detection for uAPI v2 Kent Gibson
2020-08-09 13:25 ` [PATCH v3 08/18] gpiolib: cdev: support GPIO_V2_LINE_SET_CONFIG_IOCTL Kent Gibson
2020-08-09 13:25 ` [PATCH v3 09/18] gpiolib: cdev: support GPIO_V2_LINE_SET_VALUES_IOCTL Kent Gibson
2020-08-09 13:25 ` [PATCH v3 10/18] gpiolib: cdev: support setting debounce Kent Gibson
2020-08-09 13:25 ` [PATCH v3 11/18] gpio: uapi: document uAPI v1 as deprecated Kent Gibson
2020-08-09 13:25 ` [PATCH v3 12/18] tools: gpio: port lsgpio to v2 uAPI Kent Gibson
2020-08-09 13:25 ` [PATCH v3 13/18] tools: gpio: port gpio-watch " Kent Gibson
2020-08-09 13:25 ` [PATCH v3 14/18] tools: gpio: rename nlines to num_lines Kent Gibson
2020-08-09 13:25 ` [PATCH v3 15/18] tools: gpio: port gpio-hammer to v2 uAPI Kent Gibson
2020-08-09 13:25 ` [PATCH v3 16/18] tools: gpio: port gpio-event-mon " Kent Gibson
2020-08-09 13:25 ` [PATCH v3 17/18] tools: gpio: add multi-line monitoring to gpio-event-mon Kent Gibson
2020-08-09 13:25 ` [PATCH v3 18/18] tools: gpio: add debounce support " Kent Gibson
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