From: Steven Rostedt <rostedt@goodmis.org>
To: Hans de Goede <hdegoede@redhat.com>
Cc: Daniel Vetter <daniel@ffwll.ch>,
Thomas Zimmermann <tzimmermann@suse.de>,
Petr Mladek <pmladek@suse.com>,
Linux Fbdev development list <linux-fbdev@vger.kernel.org>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Subject: Re: [PATCH v5 2/3] fbcon: Call WARN_CONSOLE_UNLOCKED() where applicable
Date: Wed, 11 Jul 2018 11:41:24 -0400 [thread overview]
Message-ID: <20180711114124.3eb23fca@gandalf.local.home> (raw)
In-Reply-To: <892782ad-4b97-8eda-f5b0-3a893b3a5f84@redhat.com>
On Wed, 11 Jul 2018 17:35:10 +0200
Hans de Goede <hdegoede@redhat.com> wrote:
> OK, so if we don't remove it, we should probably make it so that it
> can be used without triggering any WARN_ONs, which would require changing
> the existing WARN_CONSOLE_UNLOCKED() so that the calls from drivers/tty/vt/vt.c
> also do not trigger it ?
>
> I guess one can just ignore the oopses when debugging, but debugging surely
> would be easier if there are just no oopses ?
What about adding this patch (untested, not even compiled), and then
set it from the fb module.
-- Steve
diff --git a/include/linux/console.h b/include/linux/console.h
index dfd6b0e97855..11cd4956a57f 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -200,8 +200,10 @@ void vcs_make_sysfs(int index);
void vcs_remove_sysfs(int index);
/* Some debug stub to catch some of the obvious races in the VT code */
+extern bool ignore_console_lock_warning;
#if 1
-#define WARN_CONSOLE_UNLOCKED() WARN_ON(!is_console_locked() && !oops_in_progress)
+#define WARN_CONSOLE_UNLOCKED() \
+ WARN_ON(!ignore_console_lock_warning && !is_console_locked() && !oops_in_progress)
#else
#define WARN_CONSOLE_UNLOCKED()
#endif
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 247808333ba4..fa15d7ddf0c4 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -66,6 +66,9 @@ int console_printk[4] = {
CONSOLE_LOGLEVEL_DEFAULT, /* default_console_loglevel */
};
+bool ignore_console_lock_warning;
+EXPORT_SYMBOL(ignore_console_lock_warning);
+
/*
* Low level drivers may need that to know if they can schedule in
* their unblank() callback or not. So let's export it.
next prev parent reply other threads:[~2018-07-11 15:41 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20180628090357epcas5p28361ab4b3ce11c179a167548f4851983@epcas5p2.samsung.com>
2018-06-28 9:03 ` [PATCH v5 0/3] console/fbcon: Add support for deferred console takeover Hans de Goede
2018-06-28 9:03 ` [PATCH v5 1/3] printk: Export is_console_locked Hans de Goede
2018-06-28 9:03 ` [PATCH v5 2/3] fbcon: Call WARN_CONSOLE_UNLOCKED() where applicable Hans de Goede
2018-07-11 14:46 ` Thomas Zimmermann
2018-07-11 14:52 ` Steven Rostedt
2018-07-11 15:01 ` Hans de Goede
2018-07-11 15:07 ` Daniel Vetter
2018-07-11 15:07 ` Thomas Zimmermann
2018-07-11 15:14 ` Hans de Goede
2018-07-11 15:28 ` Daniel Vetter
2018-07-11 15:35 ` Hans de Goede
2018-07-11 15:41 ` Steven Rostedt [this message]
2018-07-11 15:42 ` Daniel Vetter
2018-07-11 17:35 ` Hans de Goede
2018-07-11 17:56 ` Daniel Vetter
2018-07-11 19:19 ` Steven Rostedt
2018-07-11 19:41 ` Hans de Goede
2018-07-12 10:16 ` Thomas Zimmermann
2018-07-11 23:59 ` Sergey Senozhatsky
2018-06-28 9:03 ` [PATCH v5 3/3] console/fbcon: Add support for deferred console takeover Hans de Goede
2018-07-03 16:13 ` Sergey Senozhatsky
2018-07-03 16:14 ` Steven Rostedt
2018-07-03 16:36 ` Sergey Senozhatsky
2018-06-28 13:50 ` [PATCH v5 0/3] " Bartlomiej Zolnierkiewicz
2018-06-28 15:24 ` Hans de Goede
2018-06-28 22:44 ` Gustavo Padovan
2018-06-29 10:08 ` Bartlomiej Zolnierkiewicz
2018-06-29 12:51 ` Gustavo Padovan
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