x86: Use memblock to replace early_res

1. replace find_e820_area with memblock_find_in_range
2. replace reserve_early with memblock_x86_reserve_range
3. replace free_early with memblock_x86_free_range.
4. NO_BOOTMEM will switch to use memblock too.
5. use _e820, _early wrap in the patch, in following patch, will
   replace them all
6. because memblock_x86_free_range support partial free, we can remove some special care
7. Need to make sure that memblock_find_in_range() is called after memblock_x86_fill()
   so adjust some calling later in setup.c::setup_arch()
   -- corruption_check and mptable_update

-v2: Move reserve_brk() early
    Before fill_memblock_area, to avoid overlap between brk and memblock_find_in_range()
    that could happen We have more then 128 RAM entry in E820 tables, and
    memblock_x86_fill() could use memblock_find_in_range() to find a new place for
    memblock.memory.region array.
    and We don't need to use extend_brk() after fill_memblock_area()
    So move reserve_brk() early before fill_memblock_area().
-v3: Move find_smp_config early
    To make sure memblock_find_in_range not find wrong place, if BIOS doesn't put mptable
    in right place.
-v4: Treat RESERVED_KERN as RAM in memblock.memory. and they are already in
    memblock.reserved already..
    use __NOT_KEEP_MEMBLOCK to make sure memblock related code could be freed later.
-v5: Generic version __memblock_find_in_range() is going from high to low, and for 32bit
    active_region for 32bit does include high pages
    need to replace the limit with memblock.default_alloc_limit, aka get_max_mapped()
-v6: Use current_limit instead
-v7: check with MEMBLOCK_ERROR instead of -1ULL or -1L
-v8: Set memblock_can_resize early to handle EFI with more RAM entries
-v9: update after kmemleak changes in mainline

Suggested-by: David S. Miller <davem@davemloft.net>
Suggested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 15 insertions, 35 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8c9b34674d83..f2cd7450fa76 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3667,46 +3667,26 @@ int __init add_from_early_node_map(struct range *range, int az,
 void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
                                         u64 goal, u64 limit)
 {
-        int i;
         void *ptr;
+        u64 addr;
 
-        if (limit > get_max_mapped())
-                limit = get_max_mapped();
+        if (limit > memblock.current_limit)
+                limit = memblock.current_limit;
 
-        /* need to go over early_node_map to find out good range for node */
-        for_each_active_range_index_in_nid(i, nid) {
-                u64 addr;
-                u64 ei_start, ei_last;
+        addr = find_memory_core_early(nid, size, align, goal, limit);
 
-                ei_last = early_node_map[i].end_pfn;
-                ei_last <<= PAGE_SHIFT;
-                ei_start = early_node_map[i].start_pfn;
-                ei_start <<= PAGE_SHIFT;
-                addr = find_early_area(ei_start, ei_last,
-                                         goal, limit, size, align);
-
-                if (addr == -1ULL)
-                        continue;
-
-#if 0
-                printk(KERN_DEBUG "alloc (nid=%d %llx - %llx) (%llx - %llx) %llx %llx => %llx\n",
-                                nid,
-                                ei_start, ei_last, goal, limit, size,
-                                align, addr);
-#endif
-
-                ptr = phys_to_virt(addr);
-                memset(ptr, 0, size);
-                reserve_early_without_check(addr, addr + size, "BOOTMEM");
-                /*
-                 * The min_count is set to 0 so that bootmem allocated blocks
-                 * are never reported as leaks.
-                 */
-                kmemleak_alloc(ptr, size, 0, 0);
-                return ptr;
-        }
+        if (addr == MEMBLOCK_ERROR)
+                return NULL;
 
-        return NULL;
+        ptr = phys_to_virt(addr);
+        memset(ptr, 0, size);
+        memblock_x86_reserve_range(addr, addr + size, "BOOTMEM");
+        /*
+         * The min_count is set to 0 so that bootmem allocated blocks
+         * are never reported as leaks.
+         */
+        kmemleak_alloc(ptr, size, 0, 0);
+        return ptr;
 }
 #endif