linux-kernel - Re: [PATCH v2 1/5] bitops: Introduce find_next_andnot

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Message-ID: <CAHp75VcaSwfy7kOm_d28-87QKQ5KPB69=X=Z9OYUzJJKwRCSmQ@mail.gmail.com>
Date:   Thu, 18 Aug 2022 22:04:01 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Valentin Schneider <vschneid@...hat.com>,
        netdev <netdev@...r.kernel.org>,
        "open list:HFI1 DRIVER" <linux-rdma@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Yury Norov <yury.norov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Mel Gorman <mgorman@...e.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Barry Song <song.bao.hua@...ilicon.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Tony Luck <tony.luck@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Gal Pressman <gal@...dia.com>, Tariq Toukan <tariqt@...dia.com>
Subject: Re: [PATCH v2 1/5] bitops: Introduce find_next_andnot_bit()

On Thu, Aug 18, 2022 at 8:18 PM Steven Rostedt <rostedt@...dmis.org> wrote:
> On Thu, 18 Aug 2022 17:26:43 +0100
> Valentin Schneider <vschneid@...hat.com> wrote:
>
> > How about:
>
> >
> >   find the next set bit in (*addr1 & ~*addr2)
>
> I understand the above better. But to convert that into English, we could
> say:
>
>
>   Find the next bit in *addr1 excluding all the bits in *addr2.
>
> or
>
>   Find the next bit in *addr1 that is not set in *addr2.

With this explanation I'm wondering how different this is to
bitmap_bitremap(), with adjusting to using an inverted mask. If they
have something in common, perhaps make them in the same namespace with
similar naming convention?

-- 
With Best Regards,
Andy Shevchenko