shmem: enable user xattr for tmpfs, for android-x86, original from https://www.spinics.net/lists/linux-mm/msg109775.html

shmem-xattr.patch

diff --git a/mm/shmem.c b/mm/shmem.c
index 446942677cd4..ba6ddaa4f862 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -3157,6 +3157,12 @@ static int shmem_xattr_handler_set(const struct xattr_handler *handler,
 	return simple_xattr_set(&info->xattrs, name, value, size, flags);
 }
 
+static const struct xattr_handler shmem_user_xattr_handler = {
+	.prefix = XATTR_USER_PREFIX,
+	.get = shmem_xattr_handler_get,
+	.set = shmem_xattr_handler_set,
+};
+
 static const struct xattr_handler shmem_security_xattr_handler = {
 	.prefix = XATTR_SECURITY_PREFIX,
 	.get = shmem_xattr_handler_get,
@@ -3174,6 +3180,7 @@ static const struct xattr_handler *shmem_xattr_handlers[] = {
 	&posix_acl_access_xattr_handler,
 	&posix_acl_default_xattr_handler,
 #endif
+	&shmem_user_xattr_handler,
 	&shmem_security_xattr_handler,
 	&shmem_trusted_xattr_handler,
 	NULL