Got with randconfig
include/linux/loop.h:66: error: expected specifier-qualifier-list before
'request_queue_t'
make[1]: *** [fs/compat_ioctl.o] Error 1

parts of compat ioctl require CONFIG_BLOCK to be set.

Signed-off-by: Sebastian Siewior <sebastian@breakpoint.cc>
Index: b/fs/compat_ioctl.c
===================================================================
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -63,7 +63,9 @@
 #include <linux/wireless.h>
 #include <linux/atalk.h>
 #include <linux/blktrace_api.h>
+#ifdef CONFIG_BLOCK
 #include <linux/loop.h>
+#endif
 
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci.h>
@@ -3491,8 +3493,10 @@ HANDLE_IOCTL(LPSETTIMEOUT, lp_timeout_tr
 IGNORE_IOCTL(VFAT_IOCTL_READDIR_BOTH32)
 IGNORE_IOCTL(VFAT_IOCTL_READDIR_SHORT32)
 
+#ifdef CONFIG_BLOCK
 /* loop */
 IGNORE_IOCTL(LOOP_CLR_FD)
+#endif
 };
 
 #define IOCTL_HASHSIZE 256

-- 

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