summaryrefslogtreecommitdiffstats
path: root/arch
diff options
context:
space:
mode:
authorRobin Murphy <robin.murphy@arm.com>2017-08-31 12:27:09 +0100
committerDan Williams <dan.j.williams@intel.com>2017-08-31 15:05:10 -0700
commit5deb67f77a266010e2c10fb124b7516d0d258ce8 (patch)
tree23d02b63d21e943145f2720460b32b301fefbca4 /arch
parentd9b83c7569536e3255992491737d9f895640ea18 (diff)
downloadop-kernel-dev-5deb67f77a266010e2c10fb124b7516d0d258ce8.zip
op-kernel-dev-5deb67f77a266010e2c10fb124b7516d0d258ce8.tar.gz
libnvdimm, nd_blk: remove mmio_flush_range()
mmio_flush_range() suffers from a lack of clearly-defined semantics, and is somewhat ambiguous to port to other architectures where the scope of the writeback implied by "flush" and ordering might matter, but MMIO would tend to imply non-cacheable anyway. Per the rationale in 67a3e8fe9015 ("nd_blk: change aperture mapping from WC to WB"), the only existing use is actually to invalidate clean cache lines for ARCH_MEMREMAP_PMEM type mappings *without* writeback. Since the recent cleanup of the pmem API, that also now happens to be the exact purpose of arch_invalidate_pmem(), which would be a far more well-defined tool for the job. Rather than risk potentially inconsistent implementations of mmio_flush_range() for the sake of one callsite, streamline things by removing it entirely and instead move the ARCH_MEMREMAP_PMEM related definitions up to the libnvdimm level, so they can be shared by NFIT as well. This allows NFIT to be enabled for arm64. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/Kconfig1
-rw-r--r--arch/x86/include/asm/cacheflush.h2
2 files changed, 0 insertions, 3 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 781521b..5f3b756 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -53,7 +53,6 @@ config X86
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_KCOV if X86_64
- select ARCH_HAS_MMIO_FLUSH
select ARCH_HAS_PMEM_API if X86_64
select ARCH_HAS_UACCESS_FLUSHCACHE if X86_64
select ARCH_HAS_SET_MEMORY
diff --git a/arch/x86/include/asm/cacheflush.h b/arch/x86/include/asm/cacheflush.h
index 8b4140f..cb9a1af 100644
--- a/arch/x86/include/asm/cacheflush.h
+++ b/arch/x86/include/asm/cacheflush.h
@@ -7,6 +7,4 @@
void clflush_cache_range(void *addr, unsigned int size);
-#define mmio_flush_range(addr, size) clflush_cache_range(addr, size)
-
#endif /* _ASM_X86_CACHEFLUSH_H */
OpenPOWER on IntegriCloud