linux-kernel - Re: [PATCH 02/16] vt: declare xy for get/putconsxy properly

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Message-ID: <791f5ae5-134e-794d-903e-a39d5f6ac3e2@kernel.org>
Date:   Wed, 19 Aug 2020 09:09:01 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/16] vt: declare xy for get/putconsxy properly

On 18. 08. 20, 13:43, Greg KH wrote:
> On Tue, Aug 18, 2020 at 10:56:52AM +0200, Jiri Slaby wrote:
>> That is:
>> 1) call the parameter 'xy' to denote what it really is, not generic 'p'
>> 2) tell the compiler and users that we expect an array:
>>    * with at least 2 chars (static 2)
>>    * which we don't modify in putconsxy (const)
>>
>> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
>> ---
>>  drivers/tty/vt/vt.c       | 10 +++++-----
>>  include/linux/selection.h |  4 ++--
>>  2 files changed, 7 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
>> index 8f283221330e..a0da7771c327 100644
>> --- a/drivers/tty/vt/vt.c
>> +++ b/drivers/tty/vt/vt.c
>> @@ -4769,17 +4769,17 @@ unsigned short *screen_pos(const struct vc_data *vc, int w_offset, int viewed)
>>  }
>>  EXPORT_SYMBOL_GPL(screen_pos);
>>  
>> -void getconsxy(const struct vc_data *vc, unsigned char *p)
>> +void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
> 
> I didn't realize we could do "[static 2]" in the kernel now, is that
> thanks to the bump of the minimum gcc version?  If so, nice!

gcc supports it since some time around 3.x (these kinds of declaration
are defined in c99). So hopefully nothing breaks.

thanks,
-- 
js
suse labs