[v3,1/2] powerpc/mm: Dump linux pagetables

[Michael Ellerman]

Christophe LEROY <christophe.leroy at c-s.fr> writes:
> Le 13/04/2017 à 13:31, Michael Ellerman a écrit :
>> Christophe LEROY <christophe.leroy at c-s.fr> writes:
>>> Le 17/11/2016 à 13:03, Michael Ellerman a écrit :
>>>> On Fri, 2016-27-05 at 05:48:59 UTC, Rashmica Gupta wrote:
>>>>> Useful to be able to dump the kernels page tables to check permissions
>>>>> and memory types - derived from arm64's implementation.
>>>>>
>>>>> Add a debugfs file to check the page tables. To use this the PPC_PTDUMP
>>>>> config option must be selected.
>>>>>
>>>>> Signed-off-by: Rashmica Gupta <rashmicy at gmail.com>
>>>>
>>>> Applied to powerpc next, thanks.
>>>>
>>>> https://git.kernel.org/powerpc/c/8eb07b187000d48152c4ef97f075bd
>>>
>>> For your information, compilation fails on mpc885_ads_defconfig when we
>>> activate PPC_PTDUMP:
>>>
>>>    CC      arch/powerpc/mm/dump_linuxpagetables.o
>>> arch/powerpc/mm/dump_linuxpagetables.c: In function 'walk_pagetables':
>>> arch/powerpc/mm/dump_linuxpagetables.c:369:10: error: 'KERN_VIRT_START'
>>> undeclared (first use in this function)
>>
>> Yeah it's basically 64-bit only at the moment.
>>
>> I have a TODO for it: https://github.com/linuxppc/linux/issues/88
>>
>> But I haven't got around to doing it, maybe someone who has more
>> interest in 32-bit will have time before me ;)
>
> Well, I just did it a few minutes ago.

It's like magic! :)

cheers