linux-kernel - Re: [PATCH, RESEND] serial-uartlite: un-constify uartlite_be/uartlite

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Date:	Sat, 16 Apr 2016 17:39:01 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Peter Korsgaard <jacmet@...site.dk>, Jiri Slaby <jslaby@...e.com>,
	Maarten Brock <m.brock@...mierlo.com>,
	Rich Felker <dalias@...c.org>,
	Michal Simek <michal.simek@...inx.com>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH, RESEND] serial-uartlite: un-constify
 uartlite_be/uartlite_le

On Sun, Apr 17, 2016 at 02:12:47AM +0200, Arnd Bergmann wrote:
> The patch to make uartlite_be/uartlite_le const was well-intended but
> caused a new build warning:
> 
> tty/serial/uartlite.c: In function 'ulite_request_port':
> tty/serial/uartlite.c:348:21: error: assignment discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
> tty/serial/uartlite.c:354:22: error: assignment discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
> 
> It would be nice to allow passing const pointers through
> port->private_data, but that would be way more work, so this
> reverts part of the original commit for now.
> 
> A possible alternative might be to pass a structure in the private_data
> that contains a const pointer to the operations, which introduces a little
> extra overhead, or we could just add a cast to a non-const pointer, I'll
> leave that to the maintainer.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 2905697a82ea ("serial-uartlite: Constify uartlite_be/uartlite_le")
> ---
>  drivers/tty/serial/uartlite.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> I sent this patch on March 10, but it never made it in.
> 
> Greg, could you apply the patch as a bugfix for 4.6? The warning is
> annoying as it shows up in several defconfig builds and allmodconfig.

Ugh, sorry about this, will get to it soon...