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SubjectRe: [PATCH] driver core: add a debugfs entry to show deferred devices
On Wed, Jun 20, 2018 at 1:51 AM, Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
> On Tue, Jun 19, 2018 at 10:59:14PM +0200, Javier Martinez Canillas wrote:
>> For debugging purposes it may be useful to know what are the devices whose
>> probe function was deferred. Add a debugfs entry showing that information.
>>
>> $ cat /sys/kernel/debug/deferred_devices
>> 48070000.i2c:twl@48:bci
>> musb-hdrc.0.auto
>> omapdrm.0


> And what is the use of this file? What can you do with this
> information? Who is going to use it? Don't we have other deferred
> probe debugging somewhere else?

Indeed.

Javier, have you tried to add 'initcall_debug' to a kernel command
line followed by 'dyndbg="file drivers/base/dd.c +p"'?

--
With Best Regards,
Andy Shevchenko

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