On Wed, May 30, 2018 at 12:44:29AM -0700, okaya at codeaurora.org wrote:

On 2018-05-30 00:37, Christoph Hellwig wrote:

quoted

On Tue, May 29, 2018 at 09:41:33PM -0700, Sinan Kaya wrote:

quoted

Bjorn and I discussed the need for such a "safe" mode feature when you
want to bring up PCI for a platform. You want to turn off everything
as
a starter and just stick to bare minimum.

Can we please make it a config option the instead of adding code
to every kernel?  Also maybe the bringup should be in the name
to make this more clear?

One other requirement was to have a runtime option rather than compile time
option.

When someone reported a problem, we wanted to be able to say "use this
option and see if system boots" without doing any bisects or recompilation.

This would be the first step in troubleshooting a system to see if
fundamental features are working.

That makes sense, people can not rebuild their kernels for the most
part.  Putting it behind a config option would not make sense as it
would always have to be enabled.

I don't mind changing the name Bjorn mentioned safe option. I made it
safemode. I am looking at Bjorn for suggestions at this moment.

"minimal"?  "basic"?  "crippled"?
"my_hardware_is_so_borked_it_needs_this_option"?  :)

Naming is hard...

greg k-h