netdev - Re: [PATCH 1/3] s390/vmlogrdr: Remove function pointer cast

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Date: Thu, 18 Apr 2024 07:56:11 +0200
From: Thomas Huth <thuth@...hat.com>
To: Nathan Chancellor <nathan@...nel.org>, akpm@...ux-foundation.org,
 arnd@...db.de, hca@...ux.ibm.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com
Cc: borntraeger@...ux.ibm.com, svens@...ux.ibm.com, wintera@...ux.ibm.com,
 twinkler@...ux.ibm.com, linux-s390@...r.kernel.org, netdev@...r.kernel.org,
 llvm@...ts.linux.dev, patches@...ts.linux.dev
Subject: Re: [PATCH 1/3] s390/vmlogrdr: Remove function pointer cast

On 17/04/2024 20.24, Nathan Chancellor wrote:
> Clang warns (or errors with CONFIG_WERROR) after enabling
> -Wcast-function-type-strict by default:
> 
>    drivers/s390/char/vmlogrdr.c:746:18: error: cast from 'void (*)(const void *)' to 'void (*)(struct device *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
>      746 |                 dev->release = (void (*)(struct device *))kfree;
>          |                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    1 error generated.
> 
> Add a standalone function to fix the warning properly, which addresses
> the root of the warning that these casts are not safe for kCFI. The
> comment is not really relevant after this change, so remove it.
> 
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>
> ---
>   drivers/s390/char/vmlogrdr.c | 13 +++++--------
>   1 file changed, 5 insertions(+), 8 deletions(-)

Reviewed-by: Thomas Huth <thuth@...hat.com>