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>

4 files changed, 27 insertions, 91 deletions

diff --git a/arch/x86/include/asm/memblock.h b/arch/x86/include/asm/memblock.h
index 6c72ecaee57..bc9e44b0812 100644
--- a/arch/x86/include/asm/memblock.h
+++ b/arch/x86/include/asm/memblock.h
@@ -5,9 +5,6 @@
 
 void memblock_x86_reserve_range(u64 start, u64 end, char *name);
 void memblock_x86_free_range(u64 start, u64 end);
-struct range;
-int __get_free_all_memory_range(struct range **range, int nodeid,
-                         unsigned long start_pfn, unsigned long end_pfn);
 
 u64 memblock_x86_hole_size(u64 start, u64 end);
 u64 memblock_x86_free_memory_in_range(u64 addr, u64 limit);
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 5d173db93c4..0c1da394a63 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -427,23 +427,17 @@ static void __init add_one_highpage_init(struct page *page)
 void __init add_highpages_with_active_regions(int nid,
                          unsigned long start_pfn, unsigned long end_pfn)
 {
-        struct range *range;
-        int nr_range;
-        int i;
-
-        nr_range = __get_free_all_memory_range(&range, nid, start_pfn, end_pfn);
-
-        for (i = 0; i < nr_range; i++) {
-                struct page *page;
-                int node_pfn;
-
-                for (node_pfn = range[i].start; node_pfn < range[i].end;
-                     node_pfn++) {
-                        if (!pfn_valid(node_pfn))
-                                continue;
-                        page = pfn_to_page(node_pfn);
-                        add_one_highpage_init(page);
-                }
+        phys_addr_t start, end;
+        u64 i;
+
+        for_each_free_mem_range(i, nid, &start, &end, NULL) {
+                unsigned long pfn = clamp_t(unsigned long, PFN_UP(start),
+                                            start_pfn, end_pfn);
+                unsigned long e_pfn = clamp_t(unsigned long, PFN_DOWN(end),
+                                              start_pfn, end_pfn);
+                for ( ; pfn < e_pfn; pfn++)
+                        if (pfn_valid(pfn))
+                                add_one_highpage_init(pfn_to_page(pfn));
         }
 }
 #else
diff --git a/arch/x86/mm/memblock.c b/arch/x86/mm/memblock.c
index 0e8442a9baf..4107c1a32b7 100644
--- a/arch/x86/mm/memblock.c
+++ b/arch/x86/mm/memblock.c
@@ -30,65 +30,6 @@ static __init struct range *find_range_array(int count)
         return range;
 }
 
-static void __init memblock_x86_subtract_reserved(struct range *range, int az)
-{
-        u64 final_start, final_end;
-        struct memblock_region *r;
-
-        /* Take out region array itself at first*/
-        memblock_free_reserved_regions();
-
-        memblock_dbg("Subtract (%ld early reservations)\n", memblock.reserved.cnt);
-
-        for_each_memblock(reserved, r) {
-                memblock_dbg("  [%010llx-%010llx]\n", (u64)r->base, (u64)r->base + r->size - 1);
-                final_start = PFN_DOWN(r->base);
-                final_end = PFN_UP(r->base + r->size);
-                if (final_start >= final_end)
-                        continue;
-                subtract_range(range, az, final_start, final_end);
-        }
-
-        /* Put region array back ? */
-        memblock_reserve_reserved_regions();
-}
-
-static int __init count_early_node_map(int nodeid)
-{
-        int i, cnt = 0;
-
-        for_each_mem_pfn_range(i, nodeid, NULL, NULL, NULL)
-                cnt++;
-        return cnt;
-}
-
-int __init __get_free_all_memory_range(struct range **rangep, int nodeid,
-                         unsigned long start_pfn, unsigned long end_pfn)
-{
-        int count;
-        struct range *range;
-        int nr_range;
-
-        count = (memblock.reserved.cnt + count_early_node_map(nodeid)) * 2;
-
-        range = find_range_array(count);
-        nr_range = 0;
-
-        /*
-         * Use early_node_map[] and memblock.reserved.region to get range array
-         * at first
-         */
-        nr_range = add_from_early_node_map(range, count, nr_range, nodeid);
-        subtract_range(range, count, 0, start_pfn);
-        subtract_range(range, count, end_pfn, -1ULL);
-
-        memblock_x86_subtract_reserved(range, count);
-        nr_range = clean_sort_range(range, count);
-
-        *rangep = range;
-        return nr_range;
-}
-
 static u64 __init __memblock_x86_memory_in_range(u64 addr, u64 limit, bool get_free)
 {
         int i, count;
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index 2037a8a0476..7075bc00fa8 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;
 }