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-rw-r--r--lib/Kconfig3
-rw-r--r--lib/iov_iter.c22
2 files changed, 25 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index 0c8b78a9ae2e..2d1c4b3a085c 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -548,6 +548,9 @@ config ARCH_HAS_SG_CHAIN
config ARCH_HAS_PMEM_API
bool
+config ARCH_HAS_UACCESS_FLUSHCACHE
+ bool
+
config ARCH_HAS_MMIO_FLUSH
bool
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index f835964c9485..c9a69064462f 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -615,6 +615,28 @@ size_t copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i)
}
EXPORT_SYMBOL(copy_from_iter_nocache);
+#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
+size_t copy_from_iter_flushcache(void *addr, size_t bytes, struct iov_iter *i)
+{
+ char *to = addr;
+ if (unlikely(i->type & ITER_PIPE)) {
+ WARN_ON(1);
+ return 0;
+ }
+ iterate_and_advance(i, bytes, v,
+ __copy_from_user_flushcache((to += v.iov_len) - v.iov_len,
+ v.iov_base, v.iov_len),
+ memcpy_page_flushcache((to += v.bv_len) - v.bv_len, v.bv_page,
+ v.bv_offset, v.bv_len),
+ memcpy_flushcache((to += v.iov_len) - v.iov_len, v.iov_base,
+ v.iov_len)
+ )
+
+ return bytes;
+}
+EXPORT_SYMBOL_GPL(copy_from_iter_flushcache);
+#endif
+
bool copy_from_iter_full_nocache(void *addr, size_t bytes, struct iov_iter *i)
{
char *to = addr;