Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

* 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/numa: Add constraints check for nid parameters
  mm, x86: Remove debug_pagealloc_enabled
  x86/mm: Initialize high mem before free_all_bootmem()
  arch/x86/kernel/e820.c: quiet sparse noise about plain integer as NULL pointer
  arch/x86/kernel/e820.c: Eliminate bubble sort from sanitize_e820_map()
  x86: Fix mmap random address range
  x86, mm: Unify zone_sizes_init()
  x86, mm: Prepare zone_sizes_init() for unification
  x86, mm: Use max_low_pfn for ZONE_NORMAL on 64-bit
  x86, mm: Wrap ZONE_DMA32 with CONFIG_ZONE_DMA32
  x86, mm: Use max_pfn instead of highend_pfn
  x86, mm: Move zone init from paging_init() on 64-bit
  x86, mm: Use MAX_DMA_PFN for ZONE_DMA on 32-bit

1 files changed, 24 insertions, 35 deletions

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 8071e2f3d6eb..174d938d576b 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -19,6 +19,7 @@
 #include <linux/acpi.h>
 #include <linux/firmware-map.h>
 #include <linux/memblock.h>
+#include <linux/sort.h>
 
 #include <asm/e820.h>
 #include <asm/proto.h>
@@ -227,22 +228,38 @@ void __init e820_print_map(char *who)
  *         ____________________33__
  *         ______________________4_
  */
+struct change_member {
+        struct e820entry *pbios; /* pointer to original bios entry */
+        unsigned long long addr; /* address for this change point */
+};
+
+static int __init cpcompare(const void *a, const void *b)
+{
+        struct change_member * const *app = a, * const *bpp = b;
+        const struct change_member *ap = *app, *bp = *bpp;
+
+        /*
+         * Inputs are pointers to two elements of change_point[].  If their
+         * addresses are unequal, their difference dominates.  If the addresses
+         * are equal, then consider one that represents the end of its region
+         * to be greater than one that does not.
+         */
+        if (ap->addr != bp->addr)
+                return ap->addr > bp->addr ? 1 : -1;
+
+        return (ap->addr != ap->pbios->addr) - (bp->addr != bp->pbios->addr);
+}
 
 int __init sanitize_e820_map(struct e820entry *biosmap, int max_nr_map,
                              u32 *pnr_map)
 {
-        struct change_member {
-                struct e820entry *pbios; /* pointer to original bios entry */
-                unsigned long long addr; /* address for this change point */
-        };
         static struct change_member change_point_list[2*E820_X_MAX] __initdata;
         static struct change_member *change_point[2*E820_X_MAX] __initdata;
         static struct e820entry *overlap_list[E820_X_MAX] __initdata;
         static struct e820entry new_bios[E820_X_MAX] __initdata;
-        struct change_member *change_tmp;
         unsigned long current_type, last_type;
         unsigned long long last_addr;
-        int chgidx, still_changing;
+        int chgidx;
         int overlap_entries;
         int new_bios_entry;
         int old_nr, new_nr, chg_nr;
@@ -279,35 +296,7 @@ int __init sanitize_e820_map(struct e820entry *biosmap, int max_nr_map,
         chg_nr = chgidx;
 
         /* sort change-point list by memory addresses (low -> high) */
-        still_changing = 1;
-        while (still_changing)  {
-                still_changing = 0;
-                for (i = 1; i < chg_nr; i++)  {
-                        unsigned long long curaddr, lastaddr;
-                        unsigned long long curpbaddr, lastpbaddr;
-
-                        curaddr = change_point[i]->addr;
-                        lastaddr = change_point[i - 1]->addr;
-                        curpbaddr = change_point[i]->pbios->addr;
-                        lastpbaddr = change_point[i - 1]->pbios->addr;
-
-                        /*
-                         * swap entries, when:
-                         *
-                         * curaddr > lastaddr or
-                         * curaddr == lastaddr and curaddr == curpbaddr and
-                         * lastaddr != lastpbaddr
-                         */
-                        if (curaddr < lastaddr ||
-                            (curaddr == lastaddr && curaddr == curpbaddr &&
-                             lastaddr != lastpbaddr)) {
-                                change_tmp = change_point[i];
-                                change_point[i] = change_point[i-1];
-                                change_point[i-1] = change_tmp;
-                                still_changing = 1;
-                        }
-                }
-        }
+        sort(change_point, chg_nr, sizeof *change_point, cpcompare, NULL);
 
         /* create a new bios memory map, removing overlaps */
         overlap_entries = 0;     /* number of entries in the overlap table */