mm/memblock.c: hardcode the end_pfn being -1

This is just a cleanup.  It aids handling the special end case in the
next commit.

[akpm@linux-foundation.org: make it work against current -linus, not against -mm]
[akpm@linux-foundation.org: make it work against current -linus, not against -mm some more]
Link: http://lkml.kernel.org/r/1ca478d4269125a99bcfb1ca04d7b88ac1aee924.1520011944.git.neelx@redhat.com
Signed-off-by: Daniel Vacek <neelx@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 5 deletions

diff --git a/mm/memblock.c b/mm/memblock.c
index 5a9ca2a1751b..b6ba6b7adadc 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1107,7 +1107,7 @@ unsigned long __init_memblock memblock_next_valid_pfn(unsigned long pfn,
         struct memblock_type *type = &memblock.memory;
         unsigned int right = type->cnt;
         unsigned int mid, left = 0;
-        phys_addr_t addr = PFN_PHYS(pfn + 1);
+        phys_addr_t addr = PFN_PHYS(++pfn);
 
         do {
                 mid = (right + left) / 2;
@@ -1118,15 +1118,15 @@ unsigned long __init_memblock memblock_next_valid_pfn(unsigned long pfn,
                                   type->regions[mid].size))
                         left = mid + 1;
                 else {
-                        /* addr is within the region, so pfn + 1 is valid */
-                        return min(pfn + 1, max_pfn);
+                        /* addr is within the region, so pfn is valid */
+                        return pfn;
                 }
         } while (left < right);
 
         if (right == type->cnt)
-                return max_pfn;
+                return -1UL;
         else
-                return min(PHYS_PFN(type->regions[right].base), max_pfn);
+                return PHYS_PFN(type->regions[right].base);
 }
 
 /**