asm-generic: provide entirely generic nommu uaccess

Move the code to implement uaccess using memcpy or direct loads and
stores to asm-generic/uaccess.h and make it selectable kconfig option.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/Kconfig b/lib/Kconfig
index a9e56539bd11..7a3f01ac45e8 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -591,6 +591,10 @@ config ARCH_NO_SG_CHAIN
 config ARCH_HAS_PMEM_API
         bool
 
+# use memcpy to implement user copies for nommu architectures
+config UACCESS_MEMCPY
+        bool
+
 config ARCH_HAS_UACCESS_FLUSHCACHE
         bool