linux-kernel - Re: [PATCH 5/5] parisc/sticore: Avoid hard-coding built-in font charcount

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Date:   Tue, 27 Oct 2020 20:18:14 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Peilin Ye <yepeilin.cs@...il.com>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "James E . J . Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-parisc@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] parisc/sticore: Avoid hard-coding built-in font
 charcount

On Tue, Oct 27, 2020 at 12:41:02PM -0400, Peilin Ye wrote:
> sti_select_fbfont() and sti_cook_fonts() are hard-coding the number of
> characters of our built-in fonts as 256. Recently, we included that
> information in our kernel font descriptor `struct font_desc`, so use
> `fbfont->charcount` instead of hard-coded values.
> 
> This patch depends on patch "Fonts: Add charcount field to font_desc".
> 
> Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>

Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>

> ---
> $ # Build-tested (Ubuntu 20.04)
> $ sudo apt-get install binutils-hppa64-linux-gnu gcc-7-hppa64-linux-gnu
> $ cp arch/parisc/configs/generic-64bit_defconfig .config
> $ make -j`nproc` ARCH=parisc CROSS_COMPILE=hppa64-linux-gnu- all
> 
>  drivers/video/console/sticore.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/video/console/sticore.c b/drivers/video/console/sticore.c
> index d1bb5915082b..f869b723494f 100644
> --- a/drivers/video/console/sticore.c
> +++ b/drivers/video/console/sticore.c
> @@ -506,7 +506,7 @@ sti_select_fbfont(struct sti_cooked_rom *cooked_rom, const char *fbfont_name)
>  			fbfont->width, fbfont->height, fbfont->name);
>  			
>  	bpc = ((fbfont->width+7)/8) * fbfont->height; 
> -	size = bpc * 256;
> +	size = bpc * fbfont->charcount;
>  	size += sizeof(struct sti_rom_font);
>  
>  	nf = kzalloc(size, STI_LOWMEM);
> @@ -514,7 +514,7 @@ sti_select_fbfont(struct sti_cooked_rom *cooked_rom, const char *fbfont_name)
>  		return NULL;
>  
>  	nf->first_char = 0;
> -	nf->last_char = 255;
> +	nf->last_char = fbfont->charcount - 1;
>  	nf->width = fbfont->width;
>  	nf->height = fbfont->height;
>  	nf->font_type = STI_FONT_HPROMAN8;
> @@ -525,7 +525,7 @@ sti_select_fbfont(struct sti_cooked_rom *cooked_rom, const char *fbfont_name)
>  
>  	dest = nf;
>  	dest += sizeof(struct sti_rom_font);
> -	memcpy(dest, fbfont->data, bpc*256);
> +	memcpy(dest, fbfont->data, bpc * fbfont->charcount);
>  
>  	cooked_font = kzalloc(sizeof(*cooked_font), GFP_KERNEL);
>  	if (!cooked_font) {
> @@ -660,7 +660,7 @@ static int sti_cook_fonts(struct sti_cooked_rom *cooked_rom,
>  void sti_font_convert_bytemode(struct sti_struct *sti, struct sti_cooked_font *f)
>  {
>  	unsigned char *n, *p, *q;
> -	int size = f->raw->bytes_per_char * 256 + sizeof(struct sti_rom_font);
> +	int size = f->raw->bytes_per_char * (f->raw->last_char + 1) + sizeof(struct sti_rom_font);
>  	struct sti_rom_font *old_font;
>  
>  	if (sti->wordmode)
> -- 
> 2.25.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch