Re: [PATCH v4 1/4] lib/vsprintf: Avoid redundant work with 0 size

[Petr Mladek]

On Wed 2022-02-02 15:30:33, Waiman Long wrote:
> For *scnprintf(), vsnprintf() is always called even if the input size is
> 0. That is a waste of time, so just return 0 in this case.
> 
> Note that vsnprintf() will never return -1 to indicate an error. So
> skipping the call to vsnprintf() when size is 0 will have no functional
> impact at all.
> 
> Signed-off-by: Waiman Long <longman@xxxxxxxxxx>
> Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
> Reviewed-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
> Acked-by: Roman Gushchin <guro@xxxxxx>

Reviewed-by: Petr Mladek <pmladek@xxxxxxxx>

Best Regards,
Petr