linux/kernel/printk
John Ogness c158834b22 printk: nbcon: Use nbcon consoles in console_flush_all()
Allow nbcon consoles to print messages in the legacy printk()
caller context (printing via unlock) by integrating them into
console_flush_all(). The write_atomic() callback is used for
printing.

Provide nbcon_legacy_emit_next_record(), which acts as the
nbcon variant of console_emit_next_record(). Call this variant
within console_flush_all() for nbcon consoles. Since nbcon
consoles use their own @nbcon_seq variable to track the next
record to print, this also must be appropriately handled in
console_flush_all().

Note that the legacy printing logic uses @handover to detect
handovers for printing all consoles. For nbcon consoles,
handovers/takeovers occur on a per-console basis and thus do
not cause the console_flush_all() loop to abort.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20240820063001.36405-23-john.ogness@linutronix.de
Signed-off-by: Petr Mladek <pmladek@suse.com>
2024-08-21 14:56:24 +02:00
..
braille.c printk: Replace strncmp() with str_has_prefix() 2019-08-16 09:54:08 +02:00
braille.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
console_cmdline.h printk: Add match_devname_and_update_preferred_console() 2024-07-04 15:41:44 +02:00
index.c kernel/printk/index.c: fix memory leak with using debugfs_lookup() 2023-02-03 10:42:02 +01:00
internal.h printk: nbcon: Use nbcon consoles in console_flush_all() 2024-08-21 14:56:24 +02:00
Makefile Revert "printk: Save console options for add_preferred_console_match()" 2024-06-25 07:58:10 +02:00
nbcon.c printk: nbcon: Use nbcon consoles in console_flush_all() 2024-08-21 14:56:24 +02:00
printk_ringbuffer.c printk: ringbuffer: Skip non-finalized records in panic 2024-02-07 17:23:18 +01:00
printk_ringbuffer.h printk: nbcon: Do not rely on proxy headers 2024-08-21 14:56:23 +02:00
printk_safe.c printk: Check printk_deferred_enter()/_exit() usage 2024-08-21 14:56:22 +02:00
printk.c printk: nbcon: Use nbcon consoles in console_flush_all() 2024-08-21 14:56:24 +02:00
sysctl.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00