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

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Date:	Thu, 10 Mar 2016 10:08:01 +0100
From:	"Maarten Brock" <m.brock@...mierlo.com>
To:	"Arnd Bergmann" <arnd@...db.de>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Cc:	"Arnd Bergmann" <arnd@...db.de>,
	"Peter Korsgaard" <jacmet@...site.dk>,
	"Jiri Slaby" <jslaby@...e.com>, "Rich Felker" <dalias@...c.org>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial-uartlite: un-constify uartlite_be/uartlite_le

I've created a version 2 of this patch immediately which fixes the warning,
but somehow this stays ignored.

Please apply my second patch!
Maarten

> 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(-)
> 
> diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
> index c9fdfc8bf47f..1474c5755140 100644
> --- a/drivers/tty/serial/uartlite.c
> +++ b/drivers/tty/serial/uartlite.c
> @@ -72,7 +72,7 @@ static void uartlite_outbe32(u32 val, void __iomem *addr)
>  	iowrite32be(val, addr);
>  }
>  
> -static const struct uartlite_reg_ops uartlite_be = {
> +static struct uartlite_reg_ops uartlite_be = {
>  	.in = uartlite_inbe32,
>  	.out = uartlite_outbe32,
>  };
> @@ -87,7 +87,7 @@ static void uartlite_outle32(u32 val, void __iomem *addr)
>  	iowrite32(val, addr);
>  }
>  
> -static const struct uartlite_reg_ops uartlite_le = {
> +static struct uartlite_reg_ops uartlite_le = {
>  	.in = uartlite_inle32,
>  	.out = uartlite_outle32,
>  };
> -- 
> 2.7.0
> 
>