io_uring/epoll: remove CONFIG_EPOLL guards

Just have the Makefile add the object if epoll is enabled, then it's
not necessary to guard the entire epoll.c file inside an CONFIG_EPOLL
ifdef.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: axboe

io_uring/Makefile

@@ -11,10 +11,11 @@ obj-$(CONFIG_IO_URING)		+= io_uring.o opdef.o kbuf.o rsrc.o notif.o \
 					eventfd.o uring_cmd.o openclose.o \
 					sqpoll.o xattr.o nop.o fs.o splice.o \
 					sync.o msg_ring.o advise.o openclose.o \
-					epoll.o statx.o timeout.o fdinfo.o \
-					cancel.o waitid.o register.o \
-					truncate.o memmap.o alloc_cache.o
+					statx.o timeout.o fdinfo.o cancel.o \
+					waitid.o register.o truncate.o \
+					memmap.o alloc_cache.o
 obj-$(CONFIG_IO_URING_ZCRX)	+= zcrx.o
 obj-$(CONFIG_IO_WQ)		+= io-wq.o
 obj-$(CONFIG_FUTEX)		+= futex.o
-obj-$(CONFIG_NET_RX_BUSY_POLL) += napi.o
+obj-$(CONFIG_EPOLL)		+= epoll.o
+obj-$(CONFIG_NET_RX_BUSY_POLL)	+= napi.o

io_uring/epoll.c

@@ -12,7 +12,6 @@
 #include "io_uring.h"
 #include "epoll.h"
 
-#if defined(CONFIG_EPOLL)
 struct io_epoll {
 	struct file			*file;
 	int				epfd;
@@ -58,4 +57,3 @@ int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags)
 	io_req_set_res(req, ret, 0);
 	return IOU_OK;
 }
-#endif