Merge git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86

* git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86: (32 commits)
  x86: fix page_is_ram() thinko
  x86: fix WARN_ON() message: teach page_is_ram() about the special 4Kb bios data page
  x86: i8259A: remove redundant irq_descinitialization
  x86: fix vdso_install breaks user "make install"
  x86: change IO delay back to 0x80
  x86: lds - Use THREAD_SIZE instead of numeric constant
  x86: lds - Use PAGE_SIZE instead of numeric constant
  x86 cleanup: suspend_asm_64.S - use X86_CR4_PGE instead of numeric value
  x86: docs fixes to Documentation/i386/IO-APIC.txt
  x86: fix printout ugliness in cpu info printk
  x86: clean up csum-wrappers_64.c some more
  x86: coding style fixes in arch/x86/lib/csum-wrappers_64.c
  x86: coding style fixes in arch/x86/lib/io_64.c
  x86: exclude vsyscall files from stackprotect
  x86: add pgd_large() on 64-bit, for consistency
  x86: minor cleanup of comments in processor.h
  x86: annotate pci/common.s:pci_scan_bus_with_sysdata with __devinit
  x86: fix section mismatch in head_64.S:initial_code
  x86: fix section mismatch in srat_64.c:reserve_hotadd
  x86: fix section mismatch warning in topology.c:arch_register_cpu
  ...

1 files changed, 16 insertions, 8 deletions

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 9f42d7e9c158..f4c95aec5acb 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -42,6 +42,22 @@ int page_is_ram(unsigned long pagenr)
         unsigned long addr, end;
         int i;
 
+        /*
+         * A special case is the first 4Kb of memory;
+         * This is a BIOS owned area, not kernel ram, but generally
+         * not listed as such in the E820 table.
+         */
+        if (pagenr == 0)
+                return 0;
+
+        /*
+         * Second special case: Some BIOSen report the PC BIOS
+         * area (640->1Mb) as ram even though it is not.
+         */
+        if (pagenr >= (BIOS_BEGIN >> PAGE_SHIFT) &&
+                    pagenr < (BIOS_END >> PAGE_SHIFT))
+                return 0;
+
         for (i = 0; i < e820.nr_map; i++) {
                 /*
                  * Not usable memory:
@@ -51,14 +67,6 @@ int page_is_ram(unsigned long pagenr)
                 addr = (e820.map[i].addr + PAGE_SIZE-1) >> PAGE_SHIFT;
                 end = (e820.map[i].addr + e820.map[i].size) >> PAGE_SHIFT;
 
-                /*
-                 * Sanity check: Some BIOSen report areas as RAM that
-                 * are not. Notably the 640->1Mb area, which is the
-                 * PCI BIOS area.
-                 */
-                if (addr >= (BIOS_BEGIN >> PAGE_SHIFT) &&
-                    end < (BIOS_END >> PAGE_SHIFT))
-                        continue;
 
                 if ((pagenr >= addr) && (pagenr < end))
                         return 1;