1 files changed, 24 insertions, 9 deletions

diff --git a/arch/arm/mm/highmem.c b/arch/arm/mm/highmem.c
index 21b9e1bf9b77..45aeaaca9052 100644
--- a/arch/arm/mm/highmem.c
+++ b/arch/arm/mm/highmem.c
@@ -18,6 +18,21 @@
 #include <asm/tlbflush.h>
 #include "mm.h"
 
+pte_t *fixmap_page_table;
+
+static inline void set_fixmap_pte(int idx, pte_t pte)
+{
+        unsigned long vaddr = __fix_to_virt(idx);
+        set_pte_ext(fixmap_page_table + idx, pte, 0);
+        local_flush_tlb_kernel_page(vaddr);
+}
+
+static inline pte_t get_fixmap_pte(unsigned long vaddr)
+{
+        unsigned long idx = __virt_to_fix(vaddr);
+        return *(fixmap_page_table + idx);
+}
+
 void *kmap(struct page *page)
 {
         might_sleep();
@@ -63,20 +78,20 @@ void *kmap_atomic(struct page *page)
         type = kmap_atomic_idx_push();
 
         idx = type + KM_TYPE_NR * smp_processor_id();
-        vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+        vaddr = __fix_to_virt(idx);
 #ifdef CONFIG_DEBUG_HIGHMEM
         /*
          * With debugging enabled, kunmap_atomic forces that entry to 0.
          * Make sure it was indeed properly unmapped.
          */
-        BUG_ON(!pte_none(get_top_pte(vaddr)));
+        BUG_ON(!pte_none(*(fixmap_page_table + idx)));
 #endif
         /*
          * When debugging is off, kunmap_atomic leaves the previous mapping
          * in place, so the contained TLB flush ensures the TLB is updated
          * with the new mapping.
          */
-        set_top_pte(vaddr, mk_pte(page, kmap_prot));
+        set_fixmap_pte(idx, mk_pte(page, kmap_prot));
 
         return (void *)vaddr;
 }
@@ -94,8 +109,8 @@ void __kunmap_atomic(void *kvaddr)
                 if (cache_is_vivt())
                         __cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);
 #ifdef CONFIG_DEBUG_HIGHMEM
-                BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
-                set_top_pte(vaddr, __pte(0));
+                BUG_ON(vaddr != __fix_to_virt(idx));
+                set_fixmap_pte(idx, __pte(0));
 #else
                 (void) idx;  /* to kill a warning */
 #endif
@@ -117,11 +132,11 @@ void *kmap_atomic_pfn(unsigned long pfn)
 
         type = kmap_atomic_idx_push();
         idx = type + KM_TYPE_NR * smp_processor_id();
-        vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+        vaddr = __fix_to_virt(idx);
 #ifdef CONFIG_DEBUG_HIGHMEM
-        BUG_ON(!pte_none(get_top_pte(vaddr)));
+        BUG_ON(!pte_none(*(fixmap_page_table + idx)));
 #endif
-        set_top_pte(vaddr, pfn_pte(pfn, kmap_prot));
+        set_fixmap_pte(idx, pfn_pte(pfn, kmap_prot));
 
         return (void *)vaddr;
 }
@@ -133,5 +148,5 @@ struct page *kmap_atomic_to_page(const void *ptr)
         if (vaddr < FIXADDR_START)
                 return virt_to_page(ptr);
 
-        return pte_page(get_top_pte(vaddr));
+        return pte_page(get_fixmap_pte(vaddr));
 }