io_uring/fdinfo: only compile if CONFIG_PROC_FS is set

Rather than wrap fdinfo.c in one big if, handle it on the Makefile
side instead. io_uring.c already conditionally sets fops->fdinfo()
anyway.

Signed-off-by: Jens Axboe <[email protected]>

Author: axboe

io_uring/Makefile

@@ -11,7 +11,7 @@ obj-$(CONFIG_IO_URING)		+= io_uring.o opdef.o kbuf.o rsrc.o notif.o \
 					eventfd.o uring_cmd.o openclose.o \
 					sqpoll.o xattr.o nop.o fs.o splice.o \
 					sync.o msg_ring.o advise.o openclose.o \
-					statx.o timeout.o fdinfo.o cancel.o \
+					statx.o timeout.o cancel.o \
 					waitid.o register.o truncate.o \
 					memmap.o alloc_cache.o
 obj-$(CONFIG_IO_URING_ZCRX)	+= zcrx.o
@@ -20,3 +20,4 @@ obj-$(CONFIG_FUTEX)		+= futex.o
 obj-$(CONFIG_EPOLL)		+= epoll.o
 obj-$(CONFIG_NET_RX_BUSY_POLL)	+= napi.o
 obj-$(CONFIG_NET) += net.o cmd_net.o
+obj-$(CONFIG_PROC_FS) += fdinfo.o

io_uring/fdinfo.c

@@ -15,7 +15,6 @@
 #include "cancel.h"
 #include "rsrc.h"
 
-#ifdef CONFIG_PROC_FS
 static __cold int io_uring_show_cred(struct seq_file *m, unsigned int id,
 		const struct cred *cred)
 {
@@ -264,4 +263,3 @@ __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *file)
 		mutex_unlock(&ctx->uring_lock);
 	}
 }
-#endif