x86: use early_ioremap in __acpi_map_table

__acpi_map_table() effectively reimplements early_ioremap().  Rather
than have that duplication, just implement it in terms of
early_ioremap().

However, unlike early_ioremap(), __acpi_map_table() just maintains a
single mapping which gets replaced each call, and has no corresponding
unmap function.  Implement this by just removing the previous mapping
each time its called.  Unfortunately, this will leave a stray mapping
at the end.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 7 insertions, 20 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index d37593c2f438..c518599e4264 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -121,8 +121,8 @@ enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
  */
 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
 {
-        unsigned long base, offset, mapped_size;
-        int idx;
+        static char *prev_map;
+        static unsigned long prev_size;
 
         if (!phys || !size)
                 return NULL;
@@ -130,26 +130,13 @@ char *__init __acpi_map_table(unsigned long phys, unsigned long size)
         if (phys+size <= (max_low_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);
+        if (prev_map)
+                early_iounmap(prev_map, prev_size);
 
-        /*
-         * Most cases can be covered by the below.
-         */
-        idx = FIX_ACPI_END;
-        while (mapped_size < 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;
-        }
+        prev_size = size;
+        prev_map = early_ioremap(phys, size);
 
-        return ((unsigned char *)base + offset);
+        return prev_map;
 }
 
 #ifdef CONFIG_PCI_MMCONFIG