bootmem: replace node_boot_start in struct bootmem_data

Almost all users of this field need a PFN instead of a physical address,
so replace node_boot_start with node_min_pfn.

[Lee.Schermerhorn@hp.com: fix spurious BUG_ON() in mark_bootmem()]
Signed-off-by: Johannes Weiner <hannes@saeureba.de>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 9 deletions

diff --git a/arch/ia64/mm/discontig.c b/arch/ia64/mm/discontig.c
index 2fcf8464331e..d83125e1ed27 100644
--- a/arch/ia64/mm/discontig.c
+++ b/arch/ia64/mm/discontig.c
@@ -74,17 +74,17 @@ pg_data_t *pgdat_list[MAX_NUMNODES];
 static int __init build_node_maps(unsigned long start, unsigned long len,
                                   int node)
 {
-        unsigned long cstart, epfn, end = start + len;
+        unsigned long spfn, epfn, end = start + len;
         struct bootmem_data *bdp = &bootmem_node_data[node];
 
         epfn = GRANULEROUNDUP(end) >> PAGE_SHIFT;
-        cstart = GRANULEROUNDDOWN(start);
+        spfn = GRANULEROUNDDOWN(start) >> PAGE_SHIFT;
 
         if (!bdp->node_low_pfn) {
-                bdp->node_boot_start = cstart;
+                bdp->node_min_pfn = spfn;
                 bdp->node_low_pfn = epfn;
         } else {
-                bdp->node_boot_start = min(cstart, bdp->node_boot_start);
+                bdp->node_min_pfn = min(spfn, bdp->node_min_pfn);
                 bdp->node_low_pfn = max(epfn, bdp->node_low_pfn);
         }
 
@@ -221,20 +221,21 @@ static void __init fill_pernode(int node, unsigned long pernode,
 static int __init find_pernode_space(unsigned long start, unsigned long len,
                                      int node)
 {
-        unsigned long epfn;
+        unsigned long spfn, epfn;
         unsigned long pernodesize = 0, pernode, pages, mapsize;
         struct bootmem_data *bdp = &bootmem_node_data[node];
 
+        spfn = start >> PAGE_SHIFT;
         epfn = (start + len) >> PAGE_SHIFT;
 
-        pages = bdp->node_low_pfn - (bdp->node_boot_start >> PAGE_SHIFT);
+        pages = bdp->node_low_pfn - bdp->node_min_pfn;
         mapsize = bootmem_bootmap_pages(pages) << PAGE_SHIFT;
 
         /*
          * Make sure this memory falls within this node's usable memory
          * since we may have thrown some away in build_maps().
          */
-        if (start < bdp->node_boot_start || epfn > bdp->node_low_pfn)
+        if (spfn < bdp->node_min_pfn || epfn > bdp->node_low_pfn)
                 return 0;
 
         /* Don't setup this node's local space twice... */
@@ -296,7 +297,7 @@ static void __init reserve_pernode_space(void)
                 bdp = pdp->bdata;
 
                 /* First the bootmem_map itself */
-                pages = bdp->node_low_pfn - (bdp->node_boot_start>>PAGE_SHIFT);
+                pages = bdp->node_low_pfn - bdp->node_min_pfn;
                 size = bootmem_bootmap_pages(pages) << PAGE_SHIFT;
                 base = __pa(bdp->node_bootmem_map);
                 reserve_bootmem_node(pdp, base, size, BOOTMEM_DEFAULT);
@@ -466,7 +467,7 @@ void __init find_memory(void)
 
                 init_bootmem_node(pgdat_list[node],
                                   map>>PAGE_SHIFT,
-                                  bdp->node_boot_start>>PAGE_SHIFT,
+                                  bdp->node_min_pfn,
                                   bdp->node_low_pfn);
         }