1 files changed, 10 insertions, 13 deletions

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index e78cd0ec2bcf..ae9648eb1c7f 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -20,6 +20,7 @@
 #include <asm/cacheflush.h>
 #include <asm/processor.h>
 #include <asm/tlbflush.h>
+#include <asm/x86_init.h>
 #include <asm/pgtable.h>
 #include <asm/fcntl.h>
 #include <asm/e820.h>
@@ -355,9 +356,6 @@ static int free_ram_pages_type(u64 start, u64 end)
  * - _PAGE_CACHE_UC_MINUS
  * - _PAGE_CACHE_UC
  *
- * req_type will have a special case value '-1', when requester want to inherit
- * the memory type from mtrr (if WB), existing PAT, defaulting to UC_MINUS.
- *
  * If new_type is NULL, function will return an error if it cannot reserve the
  * region with req_type. If new_type is non-NULL, function will return
  * available type in new_type in case of no error. In case of any error
@@ -377,9 +375,7 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
         if (!pat_enabled) {
                 /* This is identical to page table setting without PAT */
                 if (new_type) {
-                        if (req_type == -1)
-                                *new_type = _PAGE_CACHE_WB;
-                        else if (req_type == _PAGE_CACHE_WC)
+                        if (req_type == _PAGE_CACHE_WC)
                                 *new_type = _PAGE_CACHE_UC_MINUS;
                         else
                                 *new_type = req_type & _PAGE_CACHE_MASK;
@@ -388,7 +384,7 @@ 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 (is_ISA_range(start, end - 1)) {
+        if (x86_platform.is_untracked_pat_range(start, end)) {
                 if (new_type)
                         *new_type = _PAGE_CACHE_WB;
                 return 0;
@@ -499,7 +495,7 @@ int free_memtype(u64 start, u64 end)
                 return 0;
 
         /* Low ISA region is always mapped WB. No need to track */
-        if (is_ISA_range(start, end - 1))
+        if (x86_platform.is_untracked_pat_range(start, end))
                 return 0;
 
         is_range_ram = pat_pagerange_is_ram(start, end);
@@ -582,7 +578,7 @@ static unsigned long lookup_memtype(u64 paddr)
         int rettype = _PAGE_CACHE_WB;
         struct memtype *entry;
 
-        if (is_ISA_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)) {
@@ -708,9 +704,8 @@ int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
         if (!range_is_allowed(pfn, size))
                 return 0;
 
-        if (file->f_flags & O_SYNC) {
+        if (file->f_flags & O_DSYNC)
                 flags = _PAGE_CACHE_UC_MINUS;
-        }
 
 #ifdef CONFIG_X86_32
         /*
@@ -1018,8 +1013,10 @@ static const struct file_operations memtype_fops = {
 
 static int __init pat_memtype_list_init(void)
 {
-        debugfs_create_file("pat_memtype_list", S_IRUSR, arch_debugfs_dir,
-                                NULL, &memtype_fops);
+        if (pat_enabled) {
+                debugfs_create_file("pat_memtype_list", S_IRUSR,
+                                    arch_debugfs_dir, NULL, &memtype_fops);
+        }
         return 0;
 }