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From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Borislav Petkov <bp@alien8.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
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Subject: Re: [PATCH v0 42/42] notifier: Return an error when callback is already registered
Date: Mon, 8 Nov 2021 17:12:16 +0100	[thread overview]
Message-ID: <CAMuHMdXHikGrmUzuq0WG5JRHUUE=5zsaVCTF+e4TiHpM5tc5kA@mail.gmail.com> (raw)
In-Reply-To: <YYlJQYLiIrhjwOmT@zn.tnic>

Hi Borislav,

On Mon, Nov 8, 2021 at 4:59 PM Borislav Petkov <bp@alien8.de> wrote:
> On Mon, Nov 08, 2021 at 04:25:47PM +0100, Geert Uytterhoeven wrote:
> > I'm not against returning proper errors codes.  I'm against forcing
> > callers to check things that cannot fail and to add individual error
> > printing to each and every caller.
>
> If you're against checking things at the callers, then the registration
> function should be void. IOW, those APIs are not optimally designed atm.

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.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

  reply	other threads:[~2021-11-08 16:12 UTC|newest]

Thread overview: 77+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-08 10:11 [PATCH v0 00/42] notifiers: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 01/42] x86: Check notifier registration return value Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 02/42] xen/x86: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 03/42] impi: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 04/42] clk: renesas: " Borislav Petkov
2021-11-08 14:12   ` Geert Uytterhoeven
2021-11-08 10:11 ` [PATCH v0 05/42] dca: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 06/42] firmware: " Borislav Petkov
2021-11-12 18:43   ` Cristian Marussi
2021-11-08 10:11 ` [PATCH v0 07/42] drm/i915: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 08/42] Drivers: hv: vmbus: " Borislav Petkov
2021-11-08 11:16   ` Wei Liu
2021-11-08 11:39     ` Borislav Petkov
2021-11-08 11:45       ` Wei Liu
2021-11-08 12:08         ` Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 09/42] iio: proximity: cros_ec: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 10/42] leds: trigger: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 11/42] misc: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 12/42] ethernet: chelsio: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 13/42] power: reset: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 14/42] remoteproc: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 15/42] scsi: target: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 16/42] USB: " Borislav Petkov
2021-11-08 14:05   ` Alan Stern
2021-11-08 14:09     ` Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 17/42] drivers: video: " Borislav Petkov
2021-11-08 11:16   ` Wei Liu
2021-11-08 10:11 ` [PATCH v0 18/42] drivers/xen: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 19/42] kernel/hung_task: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 20/42] rcu: " Borislav Petkov
2021-11-08 16:53   ` Paul E. McKenney
2021-11-08 10:11 ` [PATCH v0 21/42] tracing: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 22/42] net: fib_notifier: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 23/42] ASoC: soc-jack: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 24/42] staging: olpc_dcon: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 25/42] arch/um: " Borislav Petkov
2021-11-08 10:23   ` Johannes Berg
2021-11-08 10:48     ` Borislav Petkov
2021-11-08 10:56       ` Johannes Berg
2021-11-08 10:11 ` [PATCH v0 26/42] alpha: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 27/42] bus: brcmstb_gisb: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 28/42] soc: bcm: brcmstb: pm: pm-arm: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 29/42] arm64: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 30/42] soc/tegra: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 31/42] parisc: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 32/42] macintosh/adb: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 33/42] mips: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 34/42] powerpc: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 35/42] sh: " Borislav Petkov
2021-11-08 13:31   ` Geert Uytterhoeven
2021-11-08 13:49     ` Borislav Petkov
2021-11-08 14:03       ` Geert Uytterhoeven
2021-11-08 14:48   ` Sergey Shtylyov
2021-11-08 10:11 ` [PATCH v0 36/42] s390: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 37/42] sparc: " Borislav Petkov
2021-11-08 19:59   ` David Miller
2021-11-08 10:11 ` [PATCH v0 38/42] xtensa: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 39/42] crypto: ccree - check " Borislav Petkov
2021-11-12 18:32   ` Cristian Marussi
2021-11-12 18:48     ` Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 40/42] EDAC/altera: Check " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 41/42] power: supply: ab8500: " Borislav Petkov
2021-11-08 10:11 ` [PATCH v0 42/42] notifier: Return an error when callback is already registered Borislav Petkov
2021-11-08 14:07   ` Geert Uytterhoeven
2021-11-08 14:21     ` Borislav Petkov
2021-11-08 15:25       ` Geert Uytterhoeven
2021-11-08 15:58         ` Borislav Petkov
2021-11-08 16:12           ` Geert Uytterhoeven [this message]
2021-11-08 16:21             ` Borislav Petkov
2021-11-08 20:59               ` Alan Stern
2021-11-08 21:18                 ` Borislav Petkov
2021-11-08 10:19 ` [PATCH v0 00/42] notifiers: " Borislav Petkov
2021-11-08 14:17   ` Alan Stern
2021-11-08 14:24     ` Borislav Petkov
2021-11-08 14:35       ` Borislav Petkov
2021-11-08 16:23         ` Steven Rostedt
2021-11-08 16:29           ` Borislav Petkov

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