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.

1 files changed, 2 insertions, 21 deletions

diff --git a/sys/amd64/include/sf_buf.h b/sys/amd64/include/sf_buf.h
index 729e8e5..00b3085 100644
--- a/sys/amd64/include/sf_buf.h
+++ b/sys/amd64/include/sf_buf.h
@@ -29,42 +29,23 @@
 #ifndef _MACHINE_SF_BUF_H_
 #define _MACHINE_SF_BUF_H_
 
-#include <vm/vm.h>
-#include <vm/vm_param.h>
-#include <vm/vm_page.h>
-
 /*
  * On this machine, the only purpose for which sf_buf is used is to implement
  * an opaque pointer required by the machine-independent parts of the kernel.
  * That pointer references the vm_page that is "mapped" by the sf_buf.  The
  * actual mapping is provided by the direct virtual-to-physical mapping.  
  */
-struct sf_buf;
-
-static inline struct sf_buf *
-sf_buf_alloc(struct vm_page *m, int pri)
-{
-
-	return ((struct sf_buf *)m);
-}
-
-static inline void
-sf_buf_free(struct sf_buf *sf)
-{
-}
-
-static __inline vm_offset_t
+static inline vm_offset_t
 sf_buf_kva(struct sf_buf *sf)
 {
 
 	return (PHYS_TO_DMAP(VM_PAGE_TO_PHYS((vm_page_t)sf)));
 }
 
-static __inline vm_page_t
+static inline vm_page_t
 sf_buf_page(struct sf_buf *sf)
 {
 
 	return ((vm_page_t)sf);
 }
-
 #endif /* !_MACHINE_SF_BUF_H_ */