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authorDan Williams <dan.j.williams@intel.com>2017-05-30 08:40:44 +0300
committerDan Williams <dan.j.williams@intel.com>2017-06-16 00:35:24 +0300
commit4e4f00a9b51a1c52ebdd728a1caeb3b9fe48c39d (patch)
tree949f4063c4ec29fa77660d12390942976dce8d0f /arch/x86/lib
parent81f558701ae8d5677635118751b1b4043094c7e9 (diff)
downloadlinux-4e4f00a9b51a1c52ebdd728a1caeb3b9fe48c39d.tar.xz
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>
Diffstat (limited to 'arch/x86/lib')
-rw-r--r--arch/x86/lib/usercopy_64.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/lib/usercopy_64.c b/arch/x86/lib/usercopy_64.c
index f42d2fd86ca3..75d3776123cc 100644
--- a/arch/x86/lib/usercopy_64.c
+++ b/arch/x86/lib/usercopy_64.c
@@ -97,6 +97,12 @@ static void clean_cache_range(void *addr, size_t size)
clwb(p);
}
+void arch_wb_cache_pmem(void *addr, size_t size)
+{
+ clean_cache_range(addr, size);
+}
+EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
+
long __copy_user_flushcache(void *dst, const void __user *src, unsigned size)
{
unsigned long flushed, dest = (unsigned long) dst;