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| author | John Ogness <john.ogness@linutronix.de> | 2024-08-20 08:35:52 +0206 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2024-08-21 14:56:24 +0200 |
| commit | 5dde3b7354133846079fa51e55e74ef90a836759 (patch) | |
| tree | 28e69b6323463f7e8b403154158eb7028b46ae0c /kernel/panic.c | |
| parent | d2e85ca7a736d2d889bac9aef6ede0a67f6870b2 (diff) | |
| download | linux-5dde3b7354133846079fa51e55e74ef90a836759.tar.gz linux-5dde3b7354133846079fa51e55e74ef90a836759.tar.bz2 linux-5dde3b7354133846079fa51e55e74ef90a836759.zip | |
printk: nbcon: Add unsafe flushing on panic
Add nbcon_atomic_flush_unsafe() to flush all nbcon consoles
using the write_atomic() callback and allowing unsafe hostile
takeovers. Call this at the end of panic() as a final attempt
to flush any pending messages.
Note that legacy consoles use unsafe methods for flushing
from the beginning of panic (see bust_spinlocks()). Therefore,
systems using both legacy and nbcon consoles may still fail to
see panic messages due to unsafe legacy console usage.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20240820063001.36405-27-john.ogness@linutronix.de
Signed-off-by: Petr Mladek <pmladek@suse.com>
Diffstat (limited to 'kernel/panic.c')
| -rw-r--r-- | kernel/panic.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/panic.c b/kernel/panic.c index 2a0449144f82..df37c913b010 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -463,6 +463,7 @@ void panic(const char *fmt, ...) * Explicitly flush the kernel log buffer one last time. */ console_flush_on_panic(CONSOLE_FLUSH_PENDING); + nbcon_atomic_flush_unsafe(); local_irq_enable(); for (i = 0; ; i += PANIC_TIMER_STEP) { |