memblock, x86: Replace __get_free_all_memory_range() with for_each_free_mem_range()

__get_free_all_memory_range() walks memblock, calculates free memory
areas and fills in the specified range.  It can be easily replaced
with for_each_free_mem_range().

Convert free_low_memory_core_early() and
add_highpages_with_active_regions() to for_each_free_mem_range().
This leaves __get_free_all_memory_range() without any user.  Kill it
and related functions.

Signed-off-by: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/1310462166-31469-10-git-send-email-tj@kernel.org
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 16 insertions, 12 deletions

diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index 2037a8a04761..7075bc00fa84 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -108,21 +108,25 @@ static void __init __free_pages_memory(unsigned long start, unsigned long end)
 
 unsigned long __init free_low_memory_core_early(int nodeid)
 {
-        int i;
-        u64 start, end;
         unsigned long count = 0;
-        struct range *range = NULL;
-        int nr_range;
-
-        nr_range = __get_free_all_memory_range(&range, nodeid, 0, max_low_pfn);
-
-        for (i = 0; i < nr_range; i++) {
-                start = range[i].start;
-                end = range[i].end;
-                count += end - start;
-                __free_pages_memory(start, end);
+        phys_addr_t start, end;
+        u64 i;
+
+        /* free reserved array temporarily so that it's treated as free area */
+        memblock_free_reserved_regions();
+
+        for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL) {
+                unsigned long start_pfn = PFN_UP(start);
+                unsigned long end_pfn = min_t(unsigned long,
+                                              PFN_DOWN(end), max_low_pfn);
+                if (start_pfn < end_pfn) {
+                        __free_pages_memory(start_pfn, end_pfn);
+                        count += end_pfn - start_pfn;
+                }
         }
 
+        /* put region array back? */
+        memblock_reserve_reserved_regions();
         return count;
 }