linux-kernel - Re: [PATCH 1/8] clk: Add clk_bulk

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Date:   Mon, 19 Feb 2018 18:22:29 +0000
From:   Emil Velikov <emil.l.velikov@...il.com>
To:     Maciej Purski <m.purski@...sung.com>
Cc:     linux-media@...r.kernel.org,
        "moderated list:ARM/S5P EXYNOS AR..." 
        <linux-samsung-soc@...r.kernel.org>,
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        linux-clk@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Michael Turquette <mturquette@...libre.com>,
        Kamil Debski <kamil@...as.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
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        Thibault Saunier <thibault.saunier@....samsung.com>,
        Russell King <linux@...linux.org.uk>,
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        Mauro Carvalho Chehab <mchehab@...nel.org>,
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        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Hans Verkuil <hansverk@...co.com>,
        Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH 1/8] clk: Add clk_bulk_alloc functions

HI Maciej,

Just sharing a couple of fly-by ideas - please don't read too much into them.

On 19 February 2018 at 15:43, Maciej Purski <m.purski@...sung.com> wrote:
> When a driver is going to use clk_bulk_get() function, it has to
> initialize an array of clk_bulk_data, by filling its id fields.
>
> Add a new function to the core, which dynamically allocates
> clk_bulk_data array and fills its id fields. Add clk_bulk_free()
> function, which frees the array allocated by clk_bulk_alloc() function.
> Add a managed version of clk_bulk_alloc().
>
Most places use a small fixed number of struct clk pointers.
Using devres + kalloc to allocate 1-4 pointers feels a bit strange.

Quick grep shows over 150 instances that could be updated to use the new API.
Adding a cocci script to simplify the transition would be a good idea.

> --- a/include/linux/clk.h
> +++ b/include/linux/clk.h
> @@ -15,6 +15,7 @@
>  #include <linux/err.h>
>  #include <linux/kernel.h>
>  #include <linux/notifier.h>
> +#include <linux/slab.h>
>
The extra header declaration should not be needed. One should be able
to forward declare any undefined structs.

HTH
Emil