linux-kernel - Re: [PATCH 12/34] wifi: intel: use atomic find

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Date:   Sun, 19 Nov 2023 20:58:25 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     Yury Norov <yury.norov@...il.com>, linux-kernel@...r.kernel.org,
        Stanislaw Gruszka <stf_xl@...pl>,
        Kalle Valo <kvalo@...nel.org>,
        Gregory Greenman <gregory.greenman@...el.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Miri Korenblit <miriam.rachel.korenblit@...el.com>,
        linux-wireless@...r.kernel.org
Cc:     Jan Kara <jack@...e.cz>,
        Mirsad Todorovac <mirsad.todorovac@....unizg.hr>,
        Matthew Wilcox <willy@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>,
        Alexey Klimov <klimov.linux@...il.com>
Subject: Re: [PATCH 12/34] wifi: intel: use atomic find_bit() API where
 appropriate

On Sat, 2023-11-18 at 07:50 -0800, Yury Norov wrote:
> iwlegacy and iwlwifi code opencodes atomic bit allocation/traversing by
> using loops. 

That's really just due to being lazy though, it could use a non-atomic
__test_and_set_bit() would be just fine in all of this, there's always a
mutex held around it that protects the data.

Not that it means that the helper is _wrong_, it's just unnecessary, and
you don't have non-atomic versions of these, do you?

johannes