Re: [PATCH 0/9] clocksource/drivers/clksrc-of: Improve error handling

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On 06/07/2016 11:54 AM, Geert Uytterhoeven wrote:
Hi Daniel,

On Wed, Jun 1, 2016 at 10:34 AM, Daniel Lezcano
<daniel.lezcano@xxxxxxxxxx> wrote:
The macro CLOCKSOURCE_OF_DECLARE is widely used in the timer drivers.

Basically, this macro is defined to insert in a table a tuple name,function.
This function is an init function called when the name matches the DT node and
its signature is:

         typedef void (*of_init_fn_1)(struct device_node *);

It does not return an error code.

That results in the clocksource-probe not being able to figure out if the driver
was correctly initialized or not, the different drivers to act as they were the
only ones on the system (panic, instead of failing gracefully), and duplicated
code for error reporting.

This series initiates the logic change and centralize the error handling in the
clocksource probe code.

In order to do the changes little by little, a new macro was introduced:

  CLOCKSOURCE_OF_DECLARE_RET()

As I have no other thread to reply to, I'm using this related one.

commit bcbe219f9306da478b77e705a7273843c2660d7b
Author: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Date:   Tue Jun 7 00:27:44 2016 +0200

     clocksources: Switch back to the clksrc table

     Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>

in clockevents/clockevents/next breaks the boot on e.g. r8a7791/koelsch
(arm32) and r8a7795/salvator-x (arm64).

Using "earlycon keep_bootcon" on koelsch (this doesn't help on arm64)
reveals it's stuck at:

     clocksource_probe: no matching clocksources found
     sched_clock: 32 bits at 100 Hz, resolution 10000000ns, wraps every
21474836475000000ns
     Calibrating delay loop...

With the above commit reverted, it works again:

Ah, thanks for reporting.

I will fix it.

  -- Daniel

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