From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Shevchenko Subject: Re: [PATCH v1 0/3] console, serial8250: Disable PM and DMA ops Date: Tue, 15 May 2018 21:37:18 +0300 Message-ID: References: <20180515183409.78046-1-andriy.shevchenko@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20180515183409.78046-1-andriy.shevchenko@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org To: Petr Mladek , Sergey Senozhatsky , Steven Rostedt , linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Jiri Slaby , linux-serial@vger.kernel.org, Sebastian Andrzej Siewior , Arnd Bergmann Cc: Tony Lindgren List-Id: linux-serial@vger.kernel.org On Tue, 2018-05-15 at 21:34 +0300, Andy Shevchenko wrote: > Kernel console is sensitive to any kind of complex work needed to > print > 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. +Cc: Tony. 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 Intel Finland Oy