Re: [PATCH v3] printk: use atomic updates for klogd work

[Sergey Senozhatsky]

On (22/02/11 12:29), John Ogness wrote:
> The per-cpu @printk_pending variable can be updated from
> sleepable contexts, such as:
> 
>   get_random_bytes()
>     warn_unseeded_randomness()
>       printk_deferred()
>         defer_console_output()
> 
> and can be updated from interrupt contexts, such as:
> 
>   handle_irq_event_percpu()
>     __irq_wake_thread()
>       wake_up_process()
>         try_to_wake_up()
>           select_task_rq()
>             select_fallback_rq()
>               printk_deferred()
>                 defer_console_output()
> 
> and can be updated from NMI contexts, such as:
> 
>   vprintk()
>     if (in_nmi()) defer_console_output()
> 
> Therefore the atomic variant of the updating functions must be used.
> 
> Replace __this_cpu_xchg() with this_cpu_xchg().
> Replace __this_cpu_or() with this_cpu_or().
> 
> Reported-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
> Signed-off-by: John Ogness <john.ogness@xxxxxxxxxxxxx>

FWIW
Reviewed-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>