[PATCH v3 4/6] powerpc/mm: Add devmap support for ppc64

[Michael Ellerman]

kbuild test robot <lkp at intel.com> writes:

> Hi Oliver,
>
> [auto build test ERROR on powerpc/next]
> [also build test ERROR on v4.12-rc6 next-20170623]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url:    https://github.com/0day-ci/linux/commits/Oliver-O-Halloran/mm-x86-Add-ARCH_HAS_ZONE_DEVICE-to-Kconfig/20170625-102522
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
> config: powerpc-defconfig (attached as .config)
> compiler: powerpc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
> reproduce:
>         wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         make.cross ARCH=powerpc 
>
> All errors (new ones prefixed by >>):
>
>    mm/gup.c: In function '__gup_device_huge_pud':
>>> mm/gup.c:1329:14: error: implicit declaration of function 'pud_pfn' [-Werror=implicit-function-declaration]
>      fault_pfn = pud_pfn(pud) + ((addr & ~PUD_MASK) >> PAGE_SHIFT);
>                  ^~~~~~~
>    cc1: some warnings being treated as errors

The key here is that CONFIG_TRANSPARENT_HUGEPAGE=n.

So this needs to be fixed before I can merge this.

I think the problem is just that pud_pfn() is inside #ifdef
CONFIG_TRANSPARENT_HUGEPAGE but shouldn't be.

cheers