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Message-ID: <20240213191254.GA19790@gate.crashing.org>
Date: Tue, 13 Feb 2024 13:12:54 -0600
From: Segher Boessenkool <segher@...nel.crashing.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jirislaby@...nel.org>, Arnd Bergmann <arnd@...db.de>,
llvm@...ts.linux.dev, Nick Desaulniers <ndesaulniers@...gle.com>,
linux-kernel@...r.kernel.org, Nathan Chancellor <nathan@...nel.org>,
Bill Wendling <morbo@...gle.com>, linux-serial@...r.kernel.org,
Justin Stitt <justinstitt@...gle.com>, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] tty: hvc-iucv: fix function pointer casts
On Tue, Feb 13, 2024 at 11:17:49AM +0100, Arnd Bergmann wrote:
> clang warns about explicitly casting between incompatible function
> pointers:
>
> drivers/tty/hvc/hvc_iucv.c:1100:23: error: cast from 'void (*)(const void *)' to 'void (*)(struct device *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
> 1100 | priv->dev->release = (void (*)(struct device *)) kfree;
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Such a cast of course is explicitly allowed by 6.3.2.3/8, only calling a
function using a non-compatible type is UB. This warning message is
quite misleading. Doubly so because of the -Werror, as always.
Your proposed new code of course is nice and simple (albeit a bit bigger
than it was before, both source and binary). Such is life ;-)
Segher
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