[PATCH v3] fbcon: Silence fbcon logo on 'quiet' boots

[PATCH v3] fbcon: Silence fbcon logo on 'quiet' boots

[Prarit Bhargava]

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 <prarit@redhat.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Marko Myllynen <myllynen@redhat.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Thierry Reding <treding@nvidia.com>
Cc: Yisheng Xie <ysxie@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;
 
 	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);
 
 atomic_t ignore_console_lock_warning __read_mostly = ATOMIC_INIT(0);
 EXPORT_SYMBOL(ignore_console_lock_warning);
-- 
2.14.5

Re: [PATCH v3] fbcon: Silence fbcon logo on 'quiet' boots

[Steven Rostedt]

I guess you we not very productive with that first patch ;-)

-- Steve


On October 30, 2018 5:44:19 PM GMT+02:00, Prarit Bhargava <prarit@redhat.com> 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 <prarit@redhat.com>
>Cc: Hans de Goede <hdegoede@redhat.com>
>Cc: Marko Myllynen <myllynen@redhat.com>
>Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
>Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
>Cc: Kees Cook <keescook@chromium.org>
>Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
>Cc: Thierry Reding <treding@nvidia.com>
>Cc: Yisheng Xie <ysxie@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;
> 
> 	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);
> 
> atomic_t ignore_console_lock_warning __read_mostly = ATOMIC_INIT(0);
> EXPORT_SYMBOL(ignore_console_lock_warning);

-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity and top posting.

Re: [PATCH v3] fbcon: Silence fbcon logo on 'quiet' boots

[Steven Rostedt]

I guess you we not very productive with that first patch ;-)

-- Steve


On October 30, 2018 5:44:19 PM GMT+02:00, Prarit Bhargava <prarit@redhat.com> 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 <prarit@redhat.com>
>Cc: Hans de Goede <hdegoede@redhat.com>
>Cc: Marko Myllynen <myllynen@redhat.com>
>Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
>Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
>Cc: Kees Cook <keescook@chromium.org>
>Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
>Cc: Thierry Reding <treding@nvidia.com>
>Cc: Yisheng Xie <ysxie@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;
> 
> 	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);
> 
> atomic_t ignore_console_lock_warning __read_mostly = ATOMIC_INIT(0);
> EXPORT_SYMBOL(ignore_console_lock_warning);

-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity and top posting.

Re: [PATCH v3] fbcon: Silence fbcon logo on 'quiet' boots

[Prarit Bhargava]

On 10/30/2018 05:35 PM, Steven Rostedt wrote:
> I guess you we not very productive with that first patch ;-)
> 

Hah :) It was a LONG day. :)

P.

> -- Steve
> 
> 
> On October 30, 2018 5:44:19 PM GMT+02:00, Prarit Bhargava <prarit@redhat.com> 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 <prarit@redhat.com>
>> Cc: Hans de Goede <hdegoede@redhat.com>
>> Cc: Marko Myllynen <myllynen@redhat.com>
>> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
>> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
>> Cc: Kees Cook <keescook@chromium.org>
>> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
>> Cc: Thierry Reding <treding@nvidia.com>
>> Cc: Yisheng Xie <ysxie@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;
>>
>> 	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);
>>
>> atomic_t ignore_console_lock_warning __read_mostly = ATOMIC_INIT(0);
>> EXPORT_SYMBOL(ignore_console_lock_warning);
> 

Re: [PATCH v3] fbcon: Silence fbcon logo on 'quiet' boots

[Bartlomiej Zolnierkiewicz]

[ 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 <prarit@redhat.com>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: Marko Myllynen <myllynen@redhat.com>
> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Thierry Reding <treding@nvidia.com>
> Cc: Yisheng Xie <ysxie@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

Re: [PATCH v3] fbcon: Silence fbcon logo on 'quiet' boots

[Petr Mladek]

On Thu 2018-12-20 17:31:57, Bartlomiej Zolnierkiewicz wrote:
> 
> [ 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 <prarit@redhat.com>
> > Cc: Hans de Goede <hdegoede@redhat.com>
> > Cc: Marko Myllynen <myllynen@redhat.com>
> > Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
> > Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
> > Cc: Kees Cook <keescook@chromium.org>
> > Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> > Cc: Thierry Reding <treding@nvidia.com>
> > Cc: Yisheng Xie <ysxie@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.

Good question! I am not familiar with fbcon code but it seems
that there might be more instances and they share the behavior
via this variable.

Note that console_loglevel might get modified at anytime. What if
the first fbcon was initialized with a different loglevel?


> >  	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.

I am fine with the added export (as a printk maintainer).

Best Regards,
Petr

Re: [PATCH v3] fbcon: Silence fbcon logo on 'quiet' boots

[Geert Uytterhoeven]

Hi Petr,

On Wed, Jan 2, 2019 at 6:43 PM Petr Mladek <pmladek@suse.com> wrote:
> On Thu 2018-12-20 17:31:57, Bartlomiej Zolnierkiewicz wrote:
> > [ 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 <prarit@redhat.com>
> > > Cc: Hans de Goede <hdegoede@redhat.com>
> > > Cc: Marko Myllynen <myllynen@redhat.com>
> > > Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
> > > Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
> > > Cc: Kees Cook <keescook@chromium.org>
> > > Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> > > Cc: Thierry Reding <treding@nvidia.com>
> > > Cc: Yisheng Xie <ysxie@foxmail.com>
> > > Cc: dri-devel@lists.freedesktop.org

> > > --- 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.
>
> I am fine with the added export (as a printk maintainer).

EXPORT_SYMBOL_GPL()?

The file seems to use a strange mix of both...

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH v3] fbcon: Silence fbcon logo on 'quiet' boots

[Prarit Bhargava]

On 1/2/19 11:05 AM, Petr Mladek wrote:
> On Thu 2018-12-20 17:31:57, Bartlomiej Zolnierkiewicz wrote:
>>
>> [ 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 <prarit@redhat.com>
>>> Cc: Hans de Goede <hdegoede@redhat.com>
>>> Cc: Marko Myllynen <myllynen@redhat.com>
>>> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
>>> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
>>> Cc: Kees Cook <keescook@chromium.org>
>>> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
>>> Cc: Thierry Reding <treding@nvidia.com>
>>> Cc: Yisheng Xie <ysxie@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.
> 

Hi Petr, I will drop it from the patch.

P.

> Good question! I am not familiar with fbcon code but it seems
> that there might be more instances and they share the behavior
> via this variable.
> 
> Note that console_loglevel might get modified at anytime. What if
> the first fbcon was initialized with a different loglevel?
> 
> 
>>>  	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.
> 
> I am fine with the added export (as a printk maintainer).
> 
> Best Regards,
> Petr
> 

Re: [PATCH v3] fbcon: Silence fbcon logo on 'quiet' boots

[Sergey Senozhatsky]

On (12/20/18 17:31), Bartlomiej Zolnierkiewicz wrote:
[..]
> > +++ 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.

I would prefer this to be in a separate patch, probably.

Exporting (I think EXPORT_SYMBOL_GPL would be better) console_printk[4]
seems to be the simplest solution.

Alternatively, we can have a new fbcon function which would be called
from quiet_kernel() and would set logo_shown accordingly.

	-ss

[PATCH v4 0/2] Do not output logo on quiet boots

[Prarit Bhargava]

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
v4: move console_printk change to separate patch, and drop logo cleanup

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Marko Myllynen <myllynen@redhat.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Thierry Reding <treding@nvidia.com>
Cc: Yisheng Xie <ysxie@foxmail.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: dri-devel@lists.freedesktop.org

Prarit Bhargava (2):
  fbcon: Silence fbcon logo on 'quiet' boots
  printk: Export console_printk

 drivers/video/fbdev/core/fbcon.c | 11 ++++++++---
 kernel/printk/printk.c           |  1 +
 2 files changed, 9 insertions(+), 3 deletions(-)

-- 
2.17.2

[PATCH v4 1/2] fbcon: Silence fbcon logo on 'quiet' boots

[Prarit Bhargava]

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
v4: move console_printk change to separate patch, and drop logo cleanup

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Marko Myllynen <myllynen@redhat.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Thierry Reding <treding@nvidia.com>
Cc: Yisheng Xie <ysxie@foxmail.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: dri-devel@lists.freedesktop.org
---
 drivers/video/fbdev/core/fbcon.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 8976190b6c1f..66e37bdff1d9 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;
 	}
@@ -1059,9 +1062,11 @@ static void fbcon_init(struct vc_data *vc, int init)
 
 	cap = info->flags;
 
-	if (vc != svc || logo_shown = FBCON_LOGO_DONTSHOW ||
-	    (info->fix.type = FB_TYPE_TEXT))
+	if (vc != svc || console_loglevel <= CONSOLE_LOGLEVEL_QUIET ||
+	    (info->fix.type = FB_TYPE_TEXT)) {
 		logo = 0;
+		logo_shown = FBCON_LOGO_DONTSHOW;
+	}
 
 	if (var_to_display(p, &info->var, info))
 		return;
-- 
2.17.2

Re: [PATCH v4 1/2] fbcon: Silence fbcon logo on 'quiet' boots

[Sergey Senozhatsky]

On (01/10/19 14:03), Prarit Bhargava wrote:
> +++ 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 (console_loglevel <= CONSOLE_LOGLEVEL_QUIET)
+		return;

Would this two-liner do the trick?

	-ss

> +
>  	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;
>  	}
> @@ -1059,9 +1062,11 @@ static void fbcon_init(struct vc_data *vc, int init)
>  
>  	cap = info->flags;
>  
> -	if (vc != svc || logo_shown = FBCON_LOGO_DONTSHOW ||
> -	    (info->fix.type = FB_TYPE_TEXT))
> +	if (vc != svc || console_loglevel <= CONSOLE_LOGLEVEL_QUIET ||
> +	    (info->fix.type = FB_TYPE_TEXT)) {
>  		logo = 0;
> +		logo_shown = FBCON_LOGO_DONTSHOW;
> +	}
>  
>  	if (var_to_display(p, &info->var, info))
>  		return;
> -- 
> 2.17.2
> 

Re: [PATCH v4 1/2] fbcon: Silence fbcon logo on 'quiet' boots

[Petr Mladek]

On Fri 2019-01-11 15:04:32, Sergey Senozhatsky wrote:
> On (01/10/19 14:03), Prarit Bhargava wrote:
> > +++ 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 (console_loglevel <= CONSOLE_LOGLEVEL_QUIET)
> +		return;
> 
> Would this two-liner do the trick?

But then the other functions, like fbcon_scroll() or fbcon_switch(),
would think that the logo was shown because logo_shown !FBCON_LOGO_DONTSHOW.

It might be possible to do logo_shown = FBCON_LOGO_DONTSHOW.
But I am not sure if it is safe, see below.

> 	-ss
> 
> > +
> >  	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;
> >  	}
> > @@ -1059,9 +1062,11 @@ static void fbcon_init(struct vc_data *vc, int init)
> >  
> >  	cap = info->flags;
> >  
> > -	if (vc != svc || logo_shown = FBCON_LOGO_DONTSHOW ||
> > -	    (info->fix.type = FB_TYPE_TEXT))
> > +	if (vc != svc || console_loglevel <= CONSOLE_LOGLEVEL_QUIET ||
> > +	    (info->fix.type = FB_TYPE_TEXT)) {
> >  		logo = 0;
> > +		logo_shown = FBCON_LOGO_DONTSHOW;

This has still the problem mentioned in the v3 feedback. It modifies
the global variable logo_shown even when vc != svc. You still need
check and explain why it is safe. It is not clear to me.

Best Regards,
Petr

> > +	}
> >  
> >  	if (var_to_display(p, &info->var, info))
> >  		return;
> > -- 
> > 2.17.2
> > 

[PATCH v4 2/2] printk: Export console_printk

[Prarit Bhargava]

The fbcon code can be built as a module and requires console_printk.

Export console_printk.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Marko Myllynen <myllynen@redhat.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Thierry Reding <treding@nvidia.com>
Cc: Yisheng Xie <ysxie@foxmail.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: dri-devel@lists.freedesktop.org
---
 kernel/printk/printk.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index d3d170374ceb..8201019d1fff 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -65,6 +65,7 @@ int console_printk[4] = {
 	CONSOLE_LOGLEVEL_MIN,		/* minimum_console_loglevel */
 	CONSOLE_LOGLEVEL_DEFAULT,	/* default_console_loglevel */
 };
+EXPORT_SYMBOL_GPL(console_printk);
 
 atomic_t ignore_console_lock_warning __read_mostly = ATOMIC_INIT(0);
 EXPORT_SYMBOL(ignore_console_lock_warning);
-- 
2.17.2

Re: [PATCH v4 2/2] printk: Export console_printk

[Sergey Senozhatsky]

On (01/10/19 14:03), Prarit Bhargava wrote:
> The fbcon code can be built as a module and requires console_printk.
>
> Export console_printk.
>
> Signed-off-by: Prarit Bhargava <prarit@redhat.com>
> Cc: Petr Mladek <pmladek@suse.com>
> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: Marko Myllynen <myllynen@redhat.com>
> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Thierry Reding <treding@nvidia.com>
> Cc: Yisheng Xie <ysxie@foxmail.com>
> Cc: Petr Mladek <pmladek@suse.com>
> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
> Cc: dri-devel@lists.freedesktop.org

Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

	-ss