x86, acpi: merge __acpi_map_table

and let 64-bit to fall back to use fixmap too.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 6 insertions, 17 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index bf7b4f7f60e1..a31a579a47ca 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -109,21 +109,6 @@ static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  */
 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
 
-#ifdef  CONFIG_X86_64
-
-/* rely on all ACPI tables being in the direct mapping */
-char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
-{
-        if (!phys_addr || !size)
-                return NULL;
-
-        if (phys_addr+size <= (max_pfn_mapped << PAGE_SHIFT) + PAGE_SIZE)
-                return __va(phys_addr);
-
-        return NULL;
-}
-
-#else
 
 /*
  * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
@@ -142,11 +127,15 @@ char *__init __acpi_map_table(unsigned long phys, unsigned long size)
         unsigned long base, offset, mapped_size;
         int idx;
 
-        if (phys + size < 8 * 1024 * 1024)
+        if (!phys || !size)
+                return NULL;
+
+        if (phys+size <= (max_pfn_mapped << PAGE_SHIFT))
                 return __va(phys);
 
         offset = phys & (PAGE_SIZE - 1);
         mapped_size = PAGE_SIZE - offset;
+        clear_fixmap(FIX_ACPI_END);
         set_fixmap(FIX_ACPI_END, phys);
         base = fix_to_virt(FIX_ACPI_END);
 
@@ -158,13 +147,13 @@ char *__init __acpi_map_table(unsigned long phys, unsigned long size)
                 if (--idx < FIX_ACPI_BEGIN)
                         return NULL;    /* cannot handle this */
                 phys += PAGE_SIZE;
+                clear_fixmap(idx);
                 set_fixmap(idx, phys);
                 mapped_size += PAGE_SIZE;
         }
 
         return ((unsigned char *)base + offset);
 }
-#endif
 
 #ifdef CONFIG_PCI_MMCONFIG
 /* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */