x86, numa, 32-bit: avoid clash between ramdisk and kva

use find_e820_area to get address space...

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 8 insertions, 19 deletions

diff --git a/arch/x86/mm/discontig_32.c b/arch/x86/mm/discontig_32.c
index 3150ad385672..73a983489c60 100644
--- a/arch/x86/mm/discontig_32.c
+++ b/arch/x86/mm/discontig_32.c
@@ -38,6 +38,7 @@
 #include <asm/setup.h>
 #include <asm/mmzone.h>
 #include <asm/bios_ebda.h>
+#include <asm/proto.h>
 
 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
 EXPORT_SYMBOL(node_data);
@@ -326,7 +327,6 @@ unsigned long __init setup_memory(void)
 {
         int nid;
         unsigned long system_start_pfn, system_max_low_pfn;
-        unsigned long wasted_pages;
 
         /*
          * When mapping a NUMA machine we allocate the node_mem_map arrays
@@ -337,29 +337,18 @@ unsigned long __init setup_memory(void)
          */
         get_memcfg_numa();
 
-        kva_pages = calculate_numa_remap_pages();
+        kva_pages = round_up(calculate_numa_remap_pages(), PTRS_PER_PTE);
 
         /* partially used pages are not usable - thus round upwards */
         system_start_pfn = min_low_pfn = PFN_UP(init_pg_tables_end);
 
-        kva_start_pfn = find_max_low_pfn() - kva_pages;
-
-#ifdef CONFIG_BLK_DEV_INITRD
-        /* Numa kva area is below the initrd */
-        if (initrd_start)
-                kva_start_pfn = PFN_DOWN(initrd_start - PAGE_OFFSET)
-                        - kva_pages;
-#endif
-
-        /*
-         * We waste pages past at the end of the KVA for no good reason other
-         * than how it is located. This is bad.
-         */
-        wasted_pages = kva_start_pfn & (PTRS_PER_PTE-1);
-        kva_start_pfn -= wasted_pages;
-        kva_pages += wasted_pages;
-
         system_max_low_pfn = max_low_pfn = find_max_low_pfn();
+        kva_start_pfn = round_down(max_low_pfn - kva_pages, PTRS_PER_PTE);
+        kva_start_pfn = find_e820_area(kva_start_pfn<<PAGE_SHIFT,
+                                max_low_pfn<<PAGE_SHIFT,
+                                kva_pages<<PAGE_SHIFT,
+                                PTRS_PER_PTE<<PAGE_SHIFT) >> PAGE_SHIFT;
+
         printk("kva_start_pfn ~ %ld find_max_low_pfn() ~ %ld\n",
                 kva_start_pfn, max_low_pfn);
         printk("max_pfn = %ld\n", max_pfn);