This is a first step towards getting rid of avail_start and avail_end in the

kernel, currently limited to low-hanging fruit: these variables were used
by bus_dma to specify the range in which to allocate memory, back when
uvm_pglistalloc() was stupid and would not walk the vm_physseg[].

Nowadays, except on some platforms for early initialization, these variables
are not used, or do not need to be global variables. Therefore:
- remove `extern' declarations of avail_start and avail_end (or close cousins,
  such as arm physical_start and physical_end) from files which no longer need
  to use them.
- make them local variables whenever possible.
- remove them when they are assigned to but no longer used.

3 files changed, 5 insertions, 15 deletions

diff --git a/sys/arch/amd64/amd64/bus_dma.c b/sys/arch/amd64/amd64/bus_dma.c
index b5475d6a55e..bfcd2685327 100644
--- a/sys/arch/amd64/amd64/bus_dma.c
+++ b/sys/arch/amd64/amd64/bus_dma.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bus_dma.c,v 1.33 2010/09/06 19:05:48 kettenis Exp $	*/
+/*	$OpenBSD: bus_dma.c,v 1.34 2010/11/20 20:33:23 miod Exp $	*/
 /*	$NetBSD: bus_dma.c,v 1.3 2003/05/07 21:33:58 fvdl Exp $	*/
 
 /*-
@@ -109,8 +109,6 @@
 #include <machine/mpbiosvar.h>
 #endif
 
-extern	paddr_t avail_end;
-
 int _bus_dmamap_load_buffer(bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t,
     struct proc *, int, paddr_t *, int *, int);
 
diff --git a/sys/arch/amd64/amd64/machdep.c b/sys/arch/amd64/amd64/machdep.c
index b5eaae0e9b7..f0870b235d7 100644
--- a/sys/arch/amd64/amd64/machdep.c
+++ b/sys/arch/amd64/amd64/machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: machdep.c,v 1.127 2010/11/13 04:16:42 guenther Exp $	*/
+/*	$OpenBSD: machdep.c,v 1.128 2010/11/20 20:33:23 miod Exp $	*/
 /*	$NetBSD: machdep.c,v 1.3 2003/05/07 22:58:18 fvdl Exp $	*/
 
 /*-
@@ -222,7 +222,8 @@ pid_t sigpid = 0;
 #define SDB_FOLLOW      0x01
 #endif
 
-extern	paddr_t avail_start, avail_end;
+paddr_t avail_start;
+paddr_t avail_end;
 
 void (*delay_func)(int) = i8254_delay;
 void (*initclock_func)(void) = i8254_initclocks;
diff --git a/sys/arch/amd64/amd64/pmap.c b/sys/arch/amd64/amd64/pmap.c
index 8a754946bc3..b2a068d58ae 100644
--- a/sys/arch/amd64/amd64/pmap.c
+++ b/sys/arch/amd64/amd64/pmap.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pmap.c,v 1.58 2010/11/13 04:16:42 guenther Exp $	*/
+/*	$OpenBSD: pmap.c,v 1.59 2010/11/20 20:33:23 miod Exp $	*/
 /*	$NetBSD: pmap.c,v 1.3 2003/05/08 18:13:13 thorpej Exp $	*/
 
 /*
@@ -245,15 +245,6 @@ int pmap_pg_g = 0;
 int pmap_pg_wc = PG_UCMINUS;
 
 /*
- * i386 physical memory comes in a big contig chunk with a small
- * hole toward the front of it...  the following 4 paddr_t's
- * (shared with machdep.c) describe the physical address space
- * of this machine.
- */
-paddr_t avail_start;	/* PA of first available physical page */
-paddr_t avail_end;	/* PA of last available physical page */
-
-/*
  * other data structures
  */