[PATCH A+B] pmem: Add prints at module load and unload

[Boaz Harrosh]

Hi Christoph, Ingo

It is important in the lab for postmortem analysis to know if
pmem driver loaded and/or unloaded. And the return code from this
operation.

I submit two versions [A] more chatty and version [B]. Both give me
the info I need.

I like [B] because [A] prints more lines, and also the driver might not
load at the end and we would still not see it from [A]'s prints.

But it does not matter that much just take any one you guys like
better.

Here are the commit logs:
---
[PATCH 1A] pmem: Add prints at pmem_probe/remove

Add small prints at creation/remove of pmem devices.
So we can see in dmesg logs when users loaded/unloaded
the pmem driver and what devices were created.

The prints will look like this:
Printed by e820 on load:
 [  +0.000000] user: [mem 0x0000000100000000-0x000000015fffffff] persistent (type 12)
 [  +0.000000] user: [mem 0x0000000160000000-0x00000001dfffffff] persistent (type 12)
 ...
Printed by modprobe pmem:
 [  +0.003065] pmem pmem.0.auto: probe [0x0000000100000000:0x60000000]
 [  +0.001816] pmem pmem.1.auto: probe [0x0000000160000000:0x80000000]
 ...
Printed by modprobe -r pmem:
 [ +16.299145] pmem pmem.1.auto: remove
 [  +0.011155] pmem pmem.0.auto: remove

Signed-off-by: Boaz Harrosh <boaz@xxxxxxxxxxxxx>

---
[PATCH 1B] pmem: Add prints at module load/unload

When debugging people's systems it is helpful
to see what went on. The load and unload of pmem is
an important event.

The importance is the number of loaded devices and
error status. The exact device's addresses created
we can see from the other prints at e820 so no need
to duplicate this information.

After this patch the important info at dmesg will be:

Printed by the e820 code on load:
[  +0.000000] user: [mem 0x0000000100000000-0x000000015fffffff] persistent (type 12)
[  +0.000000] user: [mem 0x0000000160000000-0x00000001dfffffff] persistent (type 12)

...
Printed by pmem modprobe:
[  +0.000537] pmem: init 2 devices => 0

...
Printed by pmem modprobe -r:
[  +0.000537] pmem: exit

Signed-off-by: Boaz Harrosh <boaz@xxxxxxxxxxxxx>
---

Thanks
Boaz


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