linux-kernel - Re: [PATCH v0 42/42] notifier: Return an error when callback is already registered

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Message-ID: <YYlOmd0AeA8DSluD@zn.tnic>
Date:   Mon, 8 Nov 2021 17:21:45 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
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Subject: Re: [PATCH v0 42/42] notifier: Return an error when callback is
 already registered

On Mon, Nov 08, 2021 at 05:12:16PM +0100, Geert Uytterhoeven wrote:
> Returning void is the other extreme ;-)
> 
> There are 3 levels (ignoring BUG_ON()/panic () inside the callee):
>   1. Return void: no one can check success or failure,
>   2. Return an error code: up to the caller to decide,
>   3. Return a __must_check error code: every caller must check.
> 
> I'm in favor of 2, as there are several places where it cannot fail.

Makes sense to me. I'll do that in the next iteration.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette