memblock: Make memblock_find_region() out of memblock_alloc_region()

This function will be used to locate a free area to put the new memblock
arrays when attempting to resize them. memblock_alloc_region() is gone,
the two callsites now call memblock_add_region().

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
v2. Fix membase_alloc_nid_region() conversion

diff --git a/mm/memblock.c b/mm/memblock.c
index a925866..c1d2060 100644 (file)
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -309,8 +309,8 @@ static phys_addr_t memblock_align_up(phys_addr_t addr, phys_addr_t size)
        return (addr + (size - 1)) & ~(size - 1);
 }
 
-static phys_addr_t __init memblock_alloc_region(phys_addr_t start, phys_addr_t end,
-                                          phys_addr_t size, phys_addr_t align)
+static phys_addr_t __init memblock_find_region(phys_addr_t start, phys_addr_t end,
+                                         phys_addr_t size, phys_addr_t align)
 {
        phys_addr_t base, res_base;
        long j;
@@ -318,12 +318,8 @@ static phys_addr_t __init memblock_alloc_region(phys_addr_t start, phys_addr_t e
        base = memblock_align_down((end - size), align);
        while (start <= base) {
                j = memblock_overlaps_region(&memblock.reserved, base, size);
-               if (j < 0) {
-                       /* this area isn't reserved, take it */
-                       if (memblock_add_region(&memblock.reserved, base, size) < 0)
-                               base = ~(phys_addr_t)0;
+               if (j < 0)
                        return base;
-               }
                res_base = memblock.reserved.regions[j].base;
                if (res_base < size)
                        break;
@@ -356,8 +352,9 @@ static phys_addr_t __init memblock_alloc_nid_region(struct memblock_region *mp,
 
                this_end = memblock_nid_range(start, end, &this_nid);
                if (this_nid == nid) {
-                       phys_addr_t ret = memblock_alloc_region(start, this_end, size, align);
-                       if (ret != ~(phys_addr_t)0)
+                       phys_addr_t ret = memblock_find_region(start, this_end, size, align);
+                       if (ret != ~(phys_addr_t)0 &&
+                           memblock_add_region(&memblock.reserved, ret, size) >= 0)
                                return ret;
                }
                start = this_end;
@@ -432,8 +429,9 @@ phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, ph
                if (memblocksize < size)
                        continue;
                base = min(memblockbase + memblocksize, max_addr);
-               res_base = memblock_alloc_region(memblockbase, base, size, align);
-               if (res_base != ~(phys_addr_t)0)
+               res_base = memblock_find_region(memblockbase, base, size, align);
+               if (res_base != ~(phys_addr_t)0 &&
+                   memblock_add_region(&memblock.reserved, res_base, size) >= 0)
                        return res_base;
        }
        return 0;