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

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Message-ID: <5713C107.5070009@gmail.com>
Date:	Sun, 17 Apr 2016 22:29:51 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Arnd Bergmann <arnd@...db.de>, 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 Sunday 17 April 2016 06:09 AM, Greg Kroah-Hartman wrote:
> 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...
>

A revert patch with the same effect posted on 11th April is also in 
waiting. http://www.spinics.net/lists/linux-serial/msg22287.html

regards
sudip