[PATCH 7/8] powerpc/rtas: warn on unsafe argument to rtas_call_unlocked()

[Nathan Lynch]

Michael Ellerman <mpe at ellerman.id.au> writes:
> Nathan Lynch <nathanl at linux.ibm.com> writes:
>> Nathan Lynch <nathanl at linux.ibm.com> writes:
>>>
>>> aside: does anyone know if the display_status() code is worth keeping?
>>> It looks like it is used to drive the 16-character wide physical LCD I
>>> remember seeing on P4-era and older machines. Is it a vestige of
>>> non-LPAR pseries that should be dropped, or is it perhaps useful for
>>> chrp or cell?
>>
>> Never mind, I see the display-character token and associated properties
>> on a P8 LPAR and in a current PAPR.
>
> Or a P10 LPAR even.
>
> The characters written using it are shown on the HMC, somewhere on the
> partition info page.

Yes, in the "Reference code" field. On the command line, you can see the
history, too:

hscroot at ltchmcv3:~> lsrefcode -r lpar -m ltczep4 --filter lpar_names=ltczep4-lp3 -n 10 -F 'time_stamp refcode'
"03/28/2023 18:38:20" "Linux ppc64le"
"03/28/2023 18:38:19" CA000093
"03/28/2023 18:38:19" CA00E891
"03/28/2023 18:38:19" CA260208
"03/28/2023 18:38:19" CA260208
"03/28/2023 18:38:19" CA00E890
"03/28/2023 18:38:19" CA000050
"03/28/2023 18:38:19" CA000040
"03/28/2023 18:38:19" CA00E880
"03/28/2023 18:38:19" CA00E879

https://www.ibm.com/docs/en/power10/000V-HMC?topic=commands-lsrefcode