46 lines
1.5 KiB
Diff
46 lines
1.5 KiB
Diff
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From: John Ogness <john.ogness@linutronix.de>
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Date: Tue, 20 Aug 2024 08:35:43 +0206
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Subject: [PATCH 17/54] printk: Let console_is_usable() handle nbcon
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.11/older/patches-6.11-rt7.tar.xz
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The nbcon consoles use a different printing callback. For nbcon
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consoles, check for the write_atomic() callback instead of
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write().
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Signed-off-by: John Ogness <john.ogness@linutronix.de>
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Reviewed-by: Petr Mladek <pmladek@suse.com>
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Link: https://lore.kernel.org/r/20240820063001.36405-18-john.ogness@linutronix.de
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Signed-off-by: Petr Mladek <pmladek@suse.com>
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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kernel/printk/internal.h | 11 +++++++++--
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1 file changed, 9 insertions(+), 2 deletions(-)
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--- a/kernel/printk/internal.h
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+++ b/kernel/printk/internal.h
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@@ -86,6 +86,8 @@ void nbcon_free(struct console *con);
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/*
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* Check if the given console is currently capable and allowed to print
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+ * records. Note that this function does not consider the current context,
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+ * which can also play a role in deciding if @con can be used to print
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* records.
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*
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* Requires the console_srcu_read_lock.
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@@ -100,8 +102,13 @@ static inline bool console_is_usable(str
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if ((flags & CON_SUSPENDED))
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return false;
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- if (!con->write)
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- return false;
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+ if (flags & CON_NBCON) {
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+ if (!con->write_atomic)
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+ return false;
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+ } else {
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+ if (!con->write)
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+ return false;
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+ }
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/*
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* Console drivers may assume that per-cpu resources have been
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