linux-kernel - Re: [PATCH] lib/find_bit: Add find_prev_*

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Date:   Wed, 2 Dec 2020 20:50:24 +0900
From:   Yun Levi <ppbuk5246@...il.com>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        dushistov@...l.ru, arnd@...db.de, akpm@...ux-foundation.org,
        gustavo@...eddedor.com, vilhelm.gray@...il.com,
        richard.weiyang@...ux.alibaba.com, joseph.qi@...ux.alibaba.com,
        skalluru@...vell.com, yury.norov@...il.com, jpoimboe@...hat.com,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH] lib/find_bit: Add find_prev_*_bit functions.

Thanks for kind advice. But I'm so afraid to have questions below:

 > - it proposes functionality w/o user (dead code)
     Actually, I add these series functions to rewrite some of the
resource clean-up routine.
     A typical case is ethtool_set_per_queue_coalesce 's rollback label.
     Could this usage be an actual use case?

 >- it lacks extension of the bitmap test module to cover the new
 > functions (that also wants to be a separate patch).
     I see, then Could I add some of testcase on lib/test_bitops.c for testing?






On Wed, Dec 2, 2020 at 7:04 PM Rasmus Villemoes
<linux@...musvillemoes.dk> wrote:
>
> On 02/12/2020 10.47, Andy Shevchenko wrote:
> > On Wed, Dec 02, 2020 at 10:10:09AM +0900, Yun Levi wrote:
> >> Inspired find_next_*bit function series, add find_prev_*_bit series.
> >> I'm not sure whether it'll be used right now But, I add these functions
> >> for future usage.
> >
> > This patch has few issues:
> > - it has more things than described (should be several patches instead)
> > - new functionality can be split logically to couple or more pieces as well
> > - it proposes functionality w/o user (dead code)
>
> Yeah, the last point means it can't be applied - please submit it again
> if and when you have an actual use case. And I'll add
>
> - it lacks extension of the bitmap test module to cover the new
> functions (that also wants to be a separate patch).
>
> Rasmus