x86, mm: is_untracked_pat_range() takes a normal semiclosed range

is_untracked_pat_range() -- like its components, is_ISA_range() and
is_GRU_range(), takes a normal semiclosed interval (>=, <) whereas the
PAT code called it as if it took a closed range (>=, <=).  Fix.

Although this is a bug, I believe it is non-manifest, simply because
none of the callers will call this with non-page-aligned addresses.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <20091119202341.GA4420@sgi.com>

2 files changed, 4 insertions, 4 deletions

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 1de2094d2e57..a34c785c5a63 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -274,7 +274,7 @@ static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
         /*
          * PAT type is always WB for untracked ranges, so no need to check.
          */
-        if (x86_platform.is_untracked_pat_range(paddr, paddr + size - 1))
+        if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
                 return 1;
 
         /*
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 38a66ef9426d..b5bc08cfcea6 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -394,7 +394,7 @@ 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 (x86_platform.is_untracked_pat_range(start, end - 1)) {
+        if (x86_platform.is_untracked_pat_range(start, end)) {
                 if (new_type)
                         *new_type = _PAGE_CACHE_WB;
                 return 0;
@@ -505,7 +505,7 @@ int free_memtype(u64 start, u64 end)
                 return 0;
 
         /* Low ISA region is always mapped WB. No need to track */
-        if (x86_platform.is_untracked_pat_range(start, end - 1))
+        if (x86_platform.is_untracked_pat_range(start, end))
                 return 0;
 
         is_range_ram = pat_pagerange_is_ram(start, end);
@@ -588,7 +588,7 @@ static unsigned long lookup_memtype(u64 paddr)
         int rettype = _PAGE_CACHE_WB;
         struct memtype *entry;
 
-        if (x86_platform.is_untracked_pat_range(paddr, paddr + PAGE_SIZE - 1))
+        if (x86_platform.is_untracked_pat_range(paddr, paddr + PAGE_SIZE))
                 return rettype;
 
         if (pat_pagerange_is_ram(paddr, paddr + PAGE_SIZE)) {