x86: make sure the CPA test code's use of _PAGE_UNUSED1 is obvious

The CPA test code uses _PAGE_UNUSED1, so make sure its obvious.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 5 insertions, 3 deletions

diff --git a/arch/x86/mm/pageattr-test.c b/arch/x86/mm/pageattr-test.c
index 7c3017287119..e1d106909218 100644
--- a/arch/x86/mm/pageattr-test.c
+++ b/arch/x86/mm/pageattr-test.c
@@ -32,7 +32,7 @@ enum {
         GPS                     = (1<<30)
 };
 
-#define PAGE_TESTBIT    __pgprot(_PAGE_UNUSED1)
+#define PAGE_CPA_TEST   __pgprot(_PAGE_CPA_TEST)
 
 static int pte_testbit(pte_t pte)
 {
@@ -174,7 +174,7 @@ static int pageattr_test(void)
                 }
 
                 test_addr = addr[i];
-                err = change_page_attr_set(&test_addr, len[i], PAGE_TESTBIT, 0);
+                err = change_page_attr_set(&test_addr, len[i], PAGE_CPA_TEST, 0);
                 if (err < 0) {
                         printk(KERN_ERR "CPA %d failed %d\n", i, err);
                         failed++;
@@ -207,7 +207,7 @@ static int pageattr_test(void)
                         continue;
                 }
                 test_addr = addr[i];
-                err = change_page_attr_clear(&test_addr, len[i], PAGE_TESTBIT, 0);
+                err = change_page_attr_clear(&test_addr, len[i], PAGE_CPA_TEST, 0);
                 if (err < 0) {
                         printk(KERN_ERR "CPA reverting failed: %d\n", err);
                         failed++;
diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h
index 04caa2f544df..eccd52406ab1 100644
--- a/include/asm-x86/pgtable.h
+++ b/include/asm-x86/pgtable.h
@@ -19,6 +19,7 @@
 #define _PAGE_BIT_UNUSED3       11
 #define _PAGE_BIT_PAT_LARGE     12      /* On 2MB or 1GB pages */
 #define _PAGE_BIT_SPECIAL       _PAGE_BIT_UNUSED1
+#define _PAGE_BIT_CPA_TEST      _PAGE_BIT_UNUSED1
 #define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */
 
 #define _PAGE_PRESENT   (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
@@ -36,6 +37,7 @@
 #define _PAGE_PAT       (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
 #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
 #define _PAGE_SPECIAL   (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
+#define _PAGE_CPA_TEST  (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
 #define __HAVE_ARCH_PTE_SPECIAL
 
 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)