linux-kernel - Re: [PATCH 6/8] lib: bitmap: support "N" as an alias for size of bitmap

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Message-ID: <CAAH8bW87PBxjoP0vsHi7JjC-VTML5yZX9+i8dGo3DiYQ4cw2=A@mail.gmail.com>
Date:   Wed, 27 Jan 2021 09:57:56 -0800
From:   Yury Norov <yury.norov@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Paul Gortmaker <paul.gortmaker@...driver.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        lizefan@...wei.com, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, josh@...htriplett.org,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...nel.org>, fweisbec@...il.com,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [PATCH 6/8] lib: bitmap: support "N" as an alias for size of bitmap

On Tue, Jan 26, 2021 at 1:40 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Tue, Jan 26, 2021 at 11:37:30PM +0200, Andy Shevchenko wrote:
> > On Tue, Jan 26, 2021 at 12:11:39PM -0500, Paul Gortmaker wrote:
>
> ...
>
> > > +   if (str[0] == 'N') {
> > > +           *num = nbits - 1;
> > > +           return str + 1;
> > > +   }
> >
> > But locating it here makes possible to enter a priori invalid input, like N for
> > start of the region.
> >
> > I think this should be separate helper which is called in places where it makes
> > sense.
>
> Okay, N is 31 on 32 core system... It is a bit counter intuitive, because it's
> rather _L_ast than _N_umber of CPUs.
>
> Changing letter?

No objections.