x86, dax, libnvdimm: remove wb_cache_pmem() indirection
authorDan Williams <dan.j.williams@intel.com>
Tue, 30 May 2017 05:40:44 +0000 (22:40 -0700)
committerDan Williams <dan.j.williams@intel.com>
Thu, 15 Jun 2017 21:35:24 +0000 (14:35 -0700)
commit4e4f00a9b51a1c52ebdd728a1caeb3b9fe48c39d
tree949f4063c4ec29fa77660d12390942976dce8d0f
parent81f558701ae8d5677635118751b1b4043094c7e9
x86, dax, libnvdimm: remove wb_cache_pmem() indirection

With all handling of the CONFIG_ARCH_HAS_PMEM_API case being moved to
libnvdimm and the pmem driver directly we do not need to provide global
wrappers and fallbacks in the CONFIG_ARCH_HAS_PMEM_API=n case. The pmem
driver will simply not link to arch_wb_cache_pmem() in that case.  Same
as before, pmem flushing is only defined for x86_64, via
clean_cache_range(), but it is straightforward to add other archs in the
future.

arch_wb_cache_pmem() is an exported function since the pmem module needs
to find it, but it is privately declared in drivers/nvdimm/pmem.h because
there are no consumers outside of the pmem driver.

Cc: <x86@kernel.org>
Cc: Jan Kara <jack@suse.cz>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Oliver O'Halloran <oohall@gmail.com>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
arch/x86/include/asm/pmem.h
arch/x86/lib/usercopy_64.c
drivers/nvdimm/pmem.c
drivers/nvdimm/pmem.h
include/linux/pmem.h