On Wed 2019-02-20 22:25:00, John Ogness wrote: > On 2019-02-20, Petr Mladek <pmladek@xxxxxxxx> wrote: > >> vprintk_emit and vprintk_store are the main functions that all printk > >> variants eventually go through. Change these to store the message in > >> the new printk ring buffer that the printk kthread is reading. > > > > Please, are there any candidates or plans to reuse the new ring > > buffer implementation? > > As you pointed out below, this patch already uses the ring buffer > implementation for a totally different purpose: NMI safe dynamic memory > allocation. I have found an alternative solution. We could calculate the length of the formatted string without any buffer: va_list args_copy; va_copy(args_copy, args); len = vscprintf(NULL, fmt, args_copy); va_end(args_copy); This vsprintf() mode was implemented for exactly this purpose. Best Regards, Petr
