linux-kernel - Re: [PATCH 10/36] tty/vt: consolemap: introduce UNI

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Date:   Wed, 8 Jun 2022 08:59:23 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial <linux-serial@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/36] tty/vt: consolemap: introduce UNI_*() macros

On 07. 06. 22, 15:47, Ilpo Järvinen wrote:
> On Tue, 7 Jun 2022, Jiri Slaby wrote:
> 
>> The code currently does shift, OR, and AND logic directly in the code.
>> It is not much obvious what happens there. Therefore define four macros
>> for that purpose and use them in the code. We use GENMASK() so that it
>> is clear which bits serve what purpose:
>> - UNI_GLYPH: bits  0.. 5
>> - UNI_ROW:   bits  6..10
>> - UNI_DIR:   bits 11..31
>>
>> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
>> ---
>>   drivers/tty/vt/consolemap.c | 21 +++++++++++++--------
>>   1 file changed, 13 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c
>> index 016c1a0b4290..e5fd225e87bd 100644
>> --- a/drivers/tty/vt/consolemap.c
>> +++ b/drivers/tty/vt/consolemap.c
>> @@ -190,6 +190,11 @@ static int inv_translate[MAX_NR_CONSOLES];
>>   #define UNI_DIR_ROWS	32U
>>   #define UNI_ROW_GLYPHS	64U
>>   
>> +#define UNI_DIR(uni)		( (uni)                   >> 11)
>> +#define UNI_ROW(uni)		(((uni) & GENMASK(10, 6)) >>  6)
> 
> This is opencoding what FIELD_GET() does. Maybe just define these as
> masks and use FIELD_GET in the code below.

Ah, great -- I was thinking there should be something for that purpose 
already, but didn't find this. But let's define these UNI_* macros using 
appropriate FIELD_GET(). (And not using FIELD_GET() in the code.)

>> +#define UNI_GLYPH(uni)		( (uni) & GENMASK( 5, 0))
thanks,
-- 
js
suse labs