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From: John Ogness <john.ogness@linutronix.de>
Date: Tue, 12 Sep 2023 13:53:21 +0000
Subject: [PATCH 15/46] printk: Let console_is_usable() handle nbcon
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.9/older/patches-6.9-rt5.tar.xz
The nbcon consoles use a different printing callback. For nbcon
consoles, check for the write_atomic() callback instead of
write().
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/printk/internal.h | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
--- a/kernel/printk/internal.h
+++ b/kernel/printk/internal.h
@@ -87,6 +87,8 @@ void nbcon_free(struct console *con);
/*
* Check if the given console is currently capable and allowed to print
+ * records. Note that this function does not consider the current context,
+ * which can also play a role in deciding if @con can be used to print
* records.
*
* Requires the console_srcu_read_lock.
@@ -101,8 +103,13 @@ static inline bool console_is_usable(str
if ((flags & CON_SUSPENDED))
return false;
- if (!con->write)
- return false;
+ if (flags & CON_NBCON) {
+ if (!con->write_atomic)
+ return false;
+ } else {
+ if (!con->write)
+ return false;
+ }
/*
* Console drivers may assume that per-cpu resources have been
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