3 files changed, 4 insertions, 4 deletions

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 7452eb31ed12..6d9960dd6f35 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -142,7 +142,7 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
         /*
          * Don't remap the low PCI/ISA area, it's always mapped..
          */
-        if (phys_addr >= ISA_START_ADDRESS && last_addr < ISA_END_ADDRESS)
+        if (is_ISA_range(phys_addr, last_addr))
                 return (__force void __iomem *)phys_to_virt(phys_addr);
 
         /*
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 227df3ca9bfd..5bbc22efe4e5 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -215,7 +215,7 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
         }
 
         /* Low ISA region is always mapped WB in page table. No need to track */
-        if (start >= ISA_START_ADDRESS && (end - 1) <= ISA_END_ADDRESS) {
+        if (is_ISA_range(start, end - 1)) {
                 if (ret_type)
                         *ret_type = _PAGE_CACHE_WB;
 
@@ -415,9 +415,8 @@ int free_memtype(u64 start, u64 end)
         }
 
         /* Low ISA region is always mapped WB. No need to track */
-        if (start >= ISA_START_ADDRESS && end <= ISA_END_ADDRESS) {
+        if (is_ISA_range(start, end - 1))
                 return 0;
-        }
 
         spin_lock(&memtype_lock);
         list_for_each_entry(ml, &memtype_list, nd) {
diff --git a/include/asm-x86/e820.h b/include/asm-x86/e820.h
index 7004251fc66b..5103d0b2c46c 100644
--- a/include/asm-x86/e820.h
+++ b/include/asm-x86/e820.h
@@ -24,6 +24,7 @@ struct e820map {
 
 #define ISA_START_ADDRESS       0xa0000
 #define ISA_END_ADDRESS         0x100000
+#define is_ISA_range(s, e) ((s) >= ISA_START_ADDRESS && (e) < ISA_END_ADDRESS)
 
 #define BIOS_BEGIN              0x000a0000
 #define BIOS_END                0x00100000