linux-kernel - Re: [PATCH] lib: Extend kstrtobool() to accept "true"/"false"

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Message-ID: <20200629120938.GC1319@bug>
Date:   Mon, 29 Jun 2020 14:09:38 +0200
From:   Pavel Machek <pavel@....cz>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Borislav Petkov <bp@...en8.de>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        rjw@...ysocki.net, viresh.kumar@...aro.org, lenb@...nel.org,
        dsmythies@...us.net, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, x86@...nel.org, jic23@....ac.uk,
        keescook@...omium.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] lib: Extend kstrtobool() to accept "true"/"false"

Hi!

> > > This is too lax - it will be enabled for any !0 value. Please accept
> > > only 0 and 1.
> > 
> > kstrtobool() ftw
> 
> And looking at that, I find it really strange it does not in fact accept
> "true" / "false", so how about this?
> 
> ---
> Subject: lib: Extend kstrtobool() to accept "true"/"false"
> 
> Extend the strings recognised by kstrtobool() to cover:
> 
>   - 1/0
>   - y/n
>   - yes/no	(new)
>   - t/f		(new)
>   - true/false  (new)
>   - on/off

Is it good idea to add more values there? It is easy to do, but... we don't want
people to use this by hand, and ideally everyone would just use 1/0...

I also see potential for confusion... as in echo off > enable_off_mode (ok, this is
with existing code, but...)

Plus, if programs learn to do "echo true > ..." they will stop working on older kernels.

Plus, this really should be documented somewhere, as it is kernel ABI.

IMO this does not need changing.

NAK.

Best regards,
									Pavel

(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html