Re: [PATCH 2/4] watchdog/softlockup: Use printk_cpu_sync_get_irqsave() to serialize reporting

[John Ogness]

On 2023-12-20, Douglas Anderson <dianders@xxxxxxxxxxxx> wrote:
> Instead of introducing a spinlock, use printk_cpu_sync_get_irqsave()
> and printk_cpu_sync_put_irqrestore() to serialize softlockup
> reporting. Alone this doesn't have any real advantage over the
> spinlock, but this will allow us to use the same function in a future
> change to also serialize hardlockup crawls.

Thanks for this change. For me, this is the preferred workaround to
best-effort serialize a particular type of output. Hopefully one day we
will get to implementing printk contexts [0] [1] so that message blocks
can be inserted atomically.

> Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>

Reviewed-by: John Ogness <john.ogness@xxxxxxxxxxxxx>

[0] https://lore.kernel.org/lkml/1299043680.4208.97.camel@Joe-Laptop
[1] https://lore.kernel.org/lkml/b17fc8afc8984fedb852921366190104@xxxxxxxxxxxxxxxx