Merge all MD sf_buf allocators into one MI, residing in kern/subr_sfbuf.c

The MD allocators were very common, however there were some minor
differencies. These differencies were all consolidated in the MI allocator,
under ifdefs. The defines from machine/vmparam.h turn on features required
for a particular machine. For details look in the comment in sys/sf_buf.h.

As result no MD code left in sys/*/*/vm_machdep.c. Some arches still have
machine/sf_buf.h, which is usually quite small.

Tested by:	glebius (i386), tuexen (arm32), kevlo (arm32)
Reviewed by:	kib
Sponsored by:	Netflix
Sponsored by:	Nginx, Inc.

2 files changed, 3 insertions, 59 deletions

diff --git a/sys/sparc64/include/sf_buf.h b/sys/sparc64/include/sf_buf.h
deleted file mode 100644
index ebbbea8..0000000
--- a/sys/sparc64/include/sf_buf.h
+++ /dev/null
@@ -1,59 +0,0 @@
-/*-
- * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $FreeBSD$
- */
-
-#ifndef _MACHINE_SF_BUF_H_
-#define _MACHINE_SF_BUF_H_
-
-#include <sys/queue.h>
-
-struct vm_page;
-
-struct sf_buf {
-	SLIST_ENTRY(sf_buf) free_list;	/* list of free buffer slots */
-	struct		vm_page *m;	/* currently mapped page */
-	vm_offset_t	kva;		/* va of mapping */
-};
-
-struct sf_buf * sf_buf_alloc(struct vm_page *m, int flags);
-void sf_buf_free(struct sf_buf *sf);
-
-static __inline vm_offset_t
-sf_buf_kva(struct sf_buf *sf)
-{
-
-	return (sf->kva);
-}
-
-static __inline struct vm_page *
-sf_buf_page(struct sf_buf *sf)
-{
-
-	return (sf->m);
-}
-
-#endif /* !_MACHINE_SF_BUF_H_ */
diff --git a/sys/sparc64/include/vmparam.h b/sys/sparc64/include/vmparam.h
index b1c90d2..10976f1 100644
--- a/sys/sparc64/include/vmparam.h
+++ b/sys/sparc64/include/vmparam.h
@@ -239,4 +239,7 @@ extern vm_offset_t vm_max_kernel_address;
  */
 #define	ZERO_REGION_SIZE	PAGE_SIZE
 
+#define	SFBUF
+#define	SFBUF_NOMD
+
 #endif /* !_MACHINE_VMPARAM_H_ */