Re: [PATCH v3 0/6] serial: Disable DMA and PM on kernel console

[Tony Lindgren <tony@atomide.com>]

* Andy Shevchenko <andriy.shevchenko@linux.intel.com> [200217 11:41]:
> This is third version to get rid of problematic DMA and PM calls in
> the serial kernel console code.
> 
> Patches 1, 3 and 4 are preparatory ones.
> 
> After previous discussion Tony suggested to add a possibility to detach
> and attach back kernel console from user space. It's done in the patch 2.
> 
> 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.
> 
> More details on topic are in the commit messages of the patches 5 and 6.
> 
> The series has been tested on few Intel platforms.
> 
> Note, it depends to recently submitted and applied patches in
> the core console code [2, 3]. Petr, may you confirm that [3] is
> immutable or even send Greg KH a PR?
> 
> Greg, see above note before applying, thanks!
> 
> [1]: https://lore.kernel.org/patchwork/cover/905632/
> [2]: https://lore.kernel.org/lkml/20200203133130.11591-1-andriy.shevchenko@linux.intel.com/
> [3]: https://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk.git/log/?h=for-5.7-console-exit
> 
> Cc: Russell King <rmk+kernel@armlinux.org.uk>
> Cc: Petr Mladek <pmladek@suse.com>
> 
> Changelog v3:
> - dropped applied patches
> - dropped "cleanup" DMA patches, that they were not tested and actually are regressions
> - added DEVICE_ATTR_RO/_RW conversion patches (Greg)
> - added pr_*() to dev_*() conversion patch (Greg)
> - updated commit message to note OMAP behaviour change (Russell)
> - replace run-time PM callbacks to be _sync() (Tony)

Nice, works for my test cases now! Please feel free to add:

Reviewed-by: Tony Lindgren <tony@atomide.com>
Tested-by: Tony Lindgren <tony@atomide.com>