Re: [PATCH v1 0/3] console, serial8250: Disable PM and DMA ops
From: Andy Shevchenko
Date: Tue May 15 2018 - 14:37:29 EST
On Tue, 2018-05-15 at 21:34 +0300, Andy Shevchenko wrote:
> Kernel console is sensitive to any kind of complex work needed to
> out anything on it. One such case is emergency print during Oops.
> This series proposes to disable runtime PM and DMA operations on 8250
> serial console.
> More detailed explanation why is provided in patch 2.
> The series has been in our internal trees for years already with no
> problems observed.
You might have some thoughts / test means for this.
> Andy Shevchenko (3):
> console: introduce ->exit() callback
> serial: 8250_port: Don't use power management for kernel console
> serial: 8250_port: Disable DMA operations for kernel console
> drivers/tty/serial/8250/8250_core.c | 9 +++++++++
> drivers/tty/serial/8250/8250_port.c | 27 ++++++++++++++++++++++-----
> include/linux/console.h | 1 +
> include/linux/serial_8250.h | 1 +
> kernel/printk/printk.c | 3 +++
> 5 files changed, 36 insertions(+), 5 deletions(-)
Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Intel Finland Oy