diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2023-09-16 21:26:06 +0206 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2023-09-18 17:03:45 +0200 |
| commit | 06653d57ff283be627a2c769139d73ecc487810f (patch) | |
| tree | 75bf0fc325ba6723dbc506c035b3cfd31624bc79 /kernel/printk/internal.h | |
| parent | ad56ebd1d79b216dc147474fac89a11daf6b10df (diff) | |
printk: nbcon: Add emit function and callback function for atomic printing
Implement an emit function for nbcon consoles to output printk
messages. It utilizes the lockless printk_get_next_message() and
console_prepend_dropped() functions to retrieve/build the output
message. The emit function includes the required safety points to
check for handover/takeover and calls a new write_atomic callback
of the console driver to output the message. It also includes
proper handling for updating the nbcon console sequence number.
A new nbcon_write_context struct is introduced. This is provided
to the write_atomic callback and includes only the information
necessary for performing atomic writes.
Co-developed-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Thomas Gleixner (Intel) <tglx@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230916192007.608398-8-john.ogness@linutronix.de
Diffstat (limited to 'kernel/printk/internal.h')
| -rw-r--r-- | kernel/printk/internal.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/printk/internal.h b/kernel/printk/internal.h index 6473f5ae4a18..6c2afee5ef62 100644 --- a/kernel/printk/internal.h +++ b/kernel/printk/internal.h @@ -130,3 +130,9 @@ struct printk_message { }; bool other_cpu_in_panic(void); +bool printk_get_next_message(struct printk_message *pmsg, u64 seq, + bool is_extended, bool may_supress); + +#ifdef CONFIG_PRINTK +void console_prepend_dropped(struct printk_message *pmsg, unsigned long dropped); +#endif |