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

[Michael Ellerman]

Christophe LEROY <christophe.leroy at c-s.fr> writes:

> Hi Rashmica,
>
> 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 ;)

cheers