linux-kernel - Re: [PATCH v6 05/12] regmap: irq: Remove unreachable goto

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Message-ID: <28982424-d425-47c3-b910-58c787e13510@sirena.org.uk>
Date: Wed, 9 Apr 2025 17:32:55 +0100
From: Mark Brown <broonie@...nel.org>
To: Andy Shevchenko <andriy.shevchenko@...el.com>
Cc: Mathieu Dubois-Briand <mathieu.dubois-briand@...tlin.com>,
	Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Kamel Bouhara <kamel.bouhara@...tlin.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Uwe Kleine-König <ukleinek@...nel.org>,
	Michael Walle <mwalle@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-input@...r.kernel.org, linux-pwm@...r.kernel.org,
	Grégory Clement <gregory.clement@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v6 05/12] regmap: irq: Remove unreachable goto

On Wed, Apr 09, 2025 at 07:00:24PM +0300, Andy Shevchenko wrote:
> On Wed, Apr 09, 2025 at 04:46:04PM +0100, Mark Brown wrote:

> > unreachable() just annotates things, AFAICT it doesn't actually
> > guarantee to do anything in particular if the annotation turns out to be
> > incorrect.

> I;m not sure I follow. unreachable is a wrapper on top of
> __builtin_unreachable() which is intrinsic of the compiler.

> https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#index-_005f_005fbuiltin_005funreachable

That just says that the program is undefined if we get to the
__builtin_undefined() and documents some behaviour around warnings.  One
example of undefined behaviour would be doing nothing.

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