linux-kernel - Re: [PATCH] firewire: fix function type cast warning

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Message-ID: <20201027001316.GA27589@workstation>
Date:   Tue, 27 Oct 2020 09:13:16 +0900
From:   Takashi Sakamoto <o-takashi@...amocchi.jp>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Stefan Richter <stefanr@...6.in-berlin.de>,
        linux1394-devel@...ts.sourceforge.net,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
        oscar.carter@...il.com
Subject: Re: [PATCH] firewire: fix function type cast warning

Hi Arnd,

On Mon, Oct 26, 2020 at 10:51:27PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> gcc -Wextra complains about a suspicious cast:
> 
> rivers/firewire/core-cdev.c:985:8: warning: cast between incompatible function types from ‘void (*)(struct fw_iso_context *, dma_addr_t,  void *)’ {aka ‘void (*)(struct fw_iso_context *, long long unsigned int,  void *)’} to ‘void (*)(struct fw_iso_context *, u32,  size_t,  void *, void *)’ {aka ‘void (*)(struct fw_iso_context *, unsigned int,  long unsigned int,  void *, void *)’} [-Wcast-function-type]
> 
> The behavior is correct in the end, but this is more clearly
> expressed using a transparent union.
> 
> Fixes: 872e330e3880 ("firewire: add isochronous multichannel reception")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/firewire/core-cdev.c |  6 +++---
>  drivers/firewire/core-iso.c  |  2 +-
>  include/linux/firewire.h     | 17 ++++++++---------
>  3 files changed, 12 insertions(+), 13 deletions(-)

Oscar Carter has posted a patch to fix it.
https://sourceforge.net/p/linux1394/mailman/message/37024966/

I don't know exactly but maintainers seems to overlook it...


Thanks

Takashi Sakamoto