linux-kernel - Re: [PATCH v3 2/3] fbdev: fbmem: allow overriding the number of bootup logos

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <125aee26-ad81-163e-eedb-7e772d802a22@samsung.com>
Date:   Fri, 3 Jan 2020 12:52:11 +0100
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Peter Rosin <peda@...ntia.se>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH v3 2/3] fbdev: fbmem: allow overriding the number of
 bootup logos


On 8/27/19 1:09 PM, Peter Rosin wrote:
> Probably most useful if you want no logo at all, or if you only want one
> logo regardless of how many CPU cores you have.
> 
> Signed-off-by: Peter Rosin <peda@...ntia.se>

Thanks, patch queued for v5.6 (also sorry for the delay).

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> ---
>  Documentation/fb/fbcon.rst       |  5 +++++
>  drivers/video/fbdev/core/fbcon.c |  7 +++++++
>  drivers/video/fbdev/core/fbmem.c | 12 +++++++++---
>  include/linux/fb.h               |  1 +
>  4 files changed, 22 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/fb/fbcon.rst b/Documentation/fb/fbcon.rst
> index 65ba40255137..e57a3d1d085a 100644
> --- a/Documentation/fb/fbcon.rst
> +++ b/Documentation/fb/fbcon.rst
> @@ -174,6 +174,11 @@ C. Boot options
>  	displayed due to multiple CPUs, the collected line of logos is moved
>  	as a whole.
>  
> +9. fbcon=logo-count:<n>
> +
> +	The value 'n' overrides the number of bootup logos. 0 disables the
> +	logo, and -1 gives the default which is the number of online CPUs.
> +
>  C. Attaching, Detaching and Unloading
>  
>  Before going on to how to attach, detach and unload the framebuffer console, an
> diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
> index c9235a2f42f8..bb6ae995c2e5 100644
> --- a/drivers/video/fbdev/core/fbcon.c
> +++ b/drivers/video/fbdev/core/fbcon.c
> @@ -536,6 +536,13 @@ static int __init fb_console_setup(char *this_opt)
>  				fb_center_logo = true;
>  			continue;
>  		}
> +
> +		if (!strncmp(options, "logo-count:", 11)) {
> +			options += 11;
> +			if (*options)
> +				fb_logo_count = simple_strtol(options, &options, 0);
> +			continue;
> +		}
>  	}
>  	return 1;
>  }
> diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
> index 64dd732021d8..c7ddcb72025b 100644
> --- a/drivers/video/fbdev/core/fbmem.c
> +++ b/drivers/video/fbdev/core/fbmem.c
> @@ -56,6 +56,8 @@ EXPORT_SYMBOL(num_registered_fb);
>  bool fb_center_logo __read_mostly;
>  EXPORT_SYMBOL(fb_center_logo);
>  
> +int fb_logo_count __read_mostly = -1;
> +
>  static struct fb_info *get_fb_info(unsigned int idx)
>  {
>  	struct fb_info *fb_info;
> @@ -620,7 +622,7 @@ int fb_prepare_logo(struct fb_info *info, int rotate)
>  	memset(&fb_logo, 0, sizeof(struct logo_data));
>  
>  	if (info->flags & FBINFO_MISC_TILEBLITTING ||
> -	    info->fbops->owner)
> +	    info->fbops->owner || !fb_logo_count)
>  		return 0;
>  
>  	if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
> @@ -686,10 +688,14 @@ int fb_prepare_logo(struct fb_info *info, int rotate)
>  
>  int fb_show_logo(struct fb_info *info, int rotate)
>  {
> +	unsigned int count;
>  	int y;
>  
> -	y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
> -			      num_online_cpus());
> +	if (!fb_logo_count)
> +		return 0;
> +
> +	count = fb_logo_count < 0 ? num_online_cpus() : fb_logo_count;
> +	y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, count);
>  	y = fb_show_extra_logos(info, y, rotate);
>  
>  	return y;
> diff --git a/include/linux/fb.h b/include/linux/fb.h
> index 303771264644..e37f72b2efca 100644
> --- a/include/linux/fb.h
> +++ b/include/linux/fb.h
> @@ -630,6 +630,7 @@ extern int fb_new_modelist(struct fb_info *info);
>  extern struct fb_info *registered_fb[FB_MAX];
>  extern int num_registered_fb;
>  extern bool fb_center_logo;
> +extern int fb_logo_count;
>  extern struct class *fb_class;
>  
>  #define for_each_registered_fb(i)		\
>