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

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Date:   Tue, 27 Oct 2020 13:48:14 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>,
        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" <linux-kernel@...r.kernel.org>,
        oscar.carter@...il.com
Subject: Re: [PATCH] firewire: fix function type cast warning

On Tue, Oct 27, 2020 at 1:13 AM Takashi Sakamoto
<o-takashi@...amocchi.jp> wrote:
> 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...

Right, that seems fairly similar to my version but avoids the GNU
extension, so it would be better that version.

       Arnd