[ added Petr & Sergey to Cc: ]
Hi,
On 10/30/2018 04:44 PM, Prarit Bhargava wrote:
> On text-based systems the 'quiet' boot option will show printk levels
> higher than CONSOLE_LOGLEVEL_QUIET. The displaying of the Tux logo
> during boot can cause some consoles to lose display data and as a result
> confuse the end user.
>
> Do not display the Tux logo on systems that are in 'quiet' boot.
>
> v2: It helps to commit all my changes before sending them. Remove extra
> bracket.
> v3: buildbot error fix: fbcon can be built as part of a module so export
> console_printk
>
> Signed-off-by: Prarit Bhargava <pra...@redhat.com>
> Cc: Hans de Goede <hdego...@redhat.com>
> Cc: Marko Myllynen <mylly...@redhat.com>
> Cc: Steven Rostedt (VMware) <rost...@goodmis.org>
> Cc: Bartlomiej Zolnierkiewicz <b.zolnier...@samsung.com>
> Cc: Kees Cook <keesc...@chromium.org>
> Cc: Daniel Vetter <daniel.vet...@ffwll.ch>
> Cc: Thierry Reding <tred...@nvidia.com>
> Cc: Yisheng Xie <ys...@foxmail.com>
> Cc: dri-devel@lists.freedesktop.org
> ---
> drivers/video/fbdev/core/fbcon.c | 13 ++++++++-----
> kernel/printk/printk.c | 1 +
> 2 files changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/video/fbdev/core/fbcon.c
> b/drivers/video/fbdev/core/fbcon.c
> index 8958ccc8b1ac..08e092eaf45c 100644
> --- a/drivers/video/fbdev/core/fbcon.c
> +++ b/drivers/video/fbdev/core/fbcon.c
> @@ -649,11 +649,14 @@ static void fbcon_prepare_logo(struct vc_data *vc,
> struct fb_info *info,
> kfree(save);
> }
>
> + if (logo_shown == FBCON_LOGO_DONTSHOW)
> + return;
> +
> if (logo_lines > vc->vc_bottom) {
> logo_shown = FBCON_LOGO_CANSHOW;
> printk(KERN_INFO
> "fbcon_init: disable boot-logo (boot-logo bigger than
> screen).\n");
> - } else if (logo_shown != FBCON_LOGO_DONTSHOW) {
> + } else {
> logo_shown = FBCON_LOGO_DRAW;
> vc->vc_top = logo_lines;
> }
> @@ -1051,7 +1054,7 @@ static void fbcon_init(struct vc_data *vc, int init)
> struct vc_data **default_mode = vc->vc_display_fg;
> struct vc_data *svc = *default_mode;
> struct display *t, *p = &fb_display[vc->vc_num];
> - int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
> + int new_rows, new_cols, rows, cols, charcnt = 256;
> int cap, ret;
>
> if (info_idx == -1 || info == NULL)
> @@ -1059,9 +1062,9 @@ static void fbcon_init(struct vc_data *vc, int init)
>
> cap = info->flags;
>
> - if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
> + if (vc != svc || console_loglevel <= CONSOLE_LOGLEVEL_QUIET ||
> (info->fix.type == FB_TYPE_TEXT))
> - logo = 0;
> + logo_shown = FBCON_LOGO_DONTSHOW;
"logo" variable removal is an unrelated change which actually
changes the code behavior ("logo_shown" will be now modified
also for "vc != svc" and "info->fix.type == FB_TYPE_TEXT" cases).
Please either drop it or explain in the patch description why
it is a safe thing to do.
> if (var_to_display(p, &info->var, info))
> return;
> @@ -1176,7 +1179,7 @@ static void fbcon_init(struct vc_data *vc, int init)
> } else
> vc_resize(vc, new_cols, new_rows);
>
> - if (logo)
> + if (logo_shown != FBCON_LOGO_DONTSHOW)
> fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
>
> if (vc == svc && softback_buf)
> diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
> index b77150ad1965..391e390feac9 100644
> --- a/kernel/printk/printk.c
> +++ b/kernel/printk/printk.c
> @@ -66,6 +66,7 @@ int console_printk[4] = {
> CONSOLE_LOGLEVEL_MIN, /* minimum_console_loglevel */
> CONSOLE_LOGLEVEL_DEFAULT, /* default_console_loglevel */
> };
> +EXPORT_SYMBOL(console_printk);
You need printk Maintainers Ack on it.
> atomic_t ignore_console_lock_warning __read_mostly = ATOMIC_INIT(0);
> EXPORT_SYMBOL(ignore_console_lock_warning);
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
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