[PATCH v6 4/8] libnvdimm/nvdimm/flush: Allow architecture to override the flush barrier

[Aneesh Kumar K.V]

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

> Hi "Aneesh,
>
> I love your patch! Yet something to improve:
>
> [auto build test ERROR on powerpc/next]
> [also build test ERROR on linux-nvdimm/libnvdimm-for-next v5.8-rc3 next-20200629]
> [cannot apply to scottwood/next]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use  as documented in
> https://git-scm.com/docs/git-format-patch]
>
> url:    https://github.com/0day-ci/linux/commits/Aneesh-Kumar-K-V/Support-new-pmem-flush-and-sync-instructions-for-POWER/20200629-223649
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
> config: arc-allyesconfig (attached as .config)
> compiler: arc-elf-gcc (GCC) 9.3.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp at intel.com>
>
> All errors (new ones prefixed by >>):
>
>    drivers/nvdimm/region_devs.c: In function 'generic_nvdimm_flush':
>>> drivers/nvdimm/region_devs.c:1215:2: error: implicit declaration of function 'arch_pmem_flush_barrier' [-Werror=implicit-function-declaration]
>     1215 |  arch_pmem_flush_barrier();
>          |  ^~~~~~~~~~~~~~~~~~~~~~~
>    cc1: some warnings being treated as errors

Ok let's move the back to include/linux/libnvdimm.h. Not all arch
include asm-generic/cacheflush.h

-aneesh