diff options
| author | John Ogness <john.ogness@linutronix.de> | 2024-02-07 14:46:58 +0106 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2024-02-07 17:23:18 +0100 |
| commit | ac7d7844c64d15603daa3e905a311ddcfbb4bc91 (patch) | |
| tree | 69deb41aa5b9ea502ebc37a8dffbf9a441d99923 /kernel/printk/printk_ringbuffer.h | |
| parent | 584528d621459d1a5c31da7a591218ad3bb96d6c (diff) | |
printk: Wait for all reserved records with pr_flush()
Currently pr_flush() will only wait for records that were
available to readers at the time of the call (using
prb_next_seq()). But there may be more records (non-finalized)
that have following finalized records. pr_flush() should wait
for these to print as well. Particularly because any trailing
finalized records may be the messages that the calling context
wants to ensure are printed.
Add a new ringbuffer function prb_next_reserve_seq() to return
the sequence number following the most recently reserved record.
This guarantees that pr_flush() will wait until all current
printk() messages (completed or in progress) have been printed.
Fixes: 3b604ca81202 ("printk: add pr_flush()")
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20240207134103.1357162-10-john.ogness@linutronix.de
Signed-off-by: Petr Mladek <pmladek@suse.com>
Diffstat (limited to 'kernel/printk/printk_ringbuffer.h')
| -rw-r--r-- | kernel/printk/printk_ringbuffer.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/printk/printk_ringbuffer.h b/kernel/printk/printk_ringbuffer.h index d49460f7578e..52626d0f1fa3 100644 --- a/kernel/printk/printk_ringbuffer.h +++ b/kernel/printk/printk_ringbuffer.h @@ -395,6 +395,7 @@ bool prb_read_valid_info(struct printk_ringbuffer *rb, u64 seq, u64 prb_first_seq(struct printk_ringbuffer *rb); u64 prb_first_valid_seq(struct printk_ringbuffer *rb); u64 prb_next_seq(struct printk_ringbuffer *rb); +u64 prb_next_reserve_seq(struct printk_ringbuffer *rb); #ifdef CONFIG_64BIT |