--- zzzz-none-000/linux-3.10.107/arch/powerpc/include/asm/pte-common.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/powerpc/include/asm/pte-common.h	2021-02-04 17:41:59.000000000 +0000
@@ -34,6 +34,12 @@
 #ifndef _PAGE_PSIZE
 #define _PAGE_PSIZE		0
 #endif
+/* _PAGE_RO and _PAGE_RW shall not be defined at the same time */
+#ifndef _PAGE_RO
+#define _PAGE_RO 0
+#else
+#define _PAGE_RW 0
+#endif
 #ifndef _PMD_PRESENT_MASK
 #define _PMD_PRESENT_MASK	_PMD_PRESENT
 #endif
@@ -42,10 +48,10 @@
 #define PMD_PAGE_SIZE(pmd)	bad_call_to_PMD_PAGE_SIZE()
 #endif
 #ifndef _PAGE_KERNEL_RO
-#define _PAGE_KERNEL_RO		0
+#define _PAGE_KERNEL_RO		(_PAGE_RO)
 #endif
 #ifndef _PAGE_KERNEL_ROX
-#define _PAGE_KERNEL_ROX	(_PAGE_EXEC)
+#define _PAGE_KERNEL_ROX	(_PAGE_EXEC | _PAGE_RO)
 #endif
 #ifndef _PAGE_KERNEL_RW
 #define _PAGE_KERNEL_RW		(_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE)
@@ -79,10 +85,8 @@
  * 64-bit PTEs
  */
 #if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT)
-#define PTE_RPN_MAX	(1ULL << (64 - PTE_RPN_SHIFT))
 #define PTE_RPN_MASK	(~((1ULL<<PTE_RPN_SHIFT)-1))
 #else
-#define PTE_RPN_MAX	(1UL << (32 - PTE_RPN_SHIFT))
 #define PTE_RPN_MASK	(~((1UL<<PTE_RPN_SHIFT)-1))
 #endif
 
@@ -95,7 +99,7 @@
 /* Mask of bits returned by pte_pgprot() */
 #define PAGE_PROT_BITS	(_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
 			 _PAGE_WRITETHRU | _PAGE_ENDIAN | _PAGE_4K_PFN | \
-			 _PAGE_USER | _PAGE_ACCESSED | \
+			 _PAGE_USER | _PAGE_ACCESSED | _PAGE_RO | \
 			 _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_EXEC)
 
 /*
@@ -105,7 +109,8 @@
  * the processor might need it for DMA coherency.
  */
 #define _PAGE_BASE_NC	(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
-#if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU)
+#if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU) || \
+	defined(CONFIG_PPC_E500MC)
 #define _PAGE_BASE	(_PAGE_BASE_NC | _PAGE_COHERENT)
 #else
 #define _PAGE_BASE	(_PAGE_BASE_NC)
@@ -123,11 +128,14 @@
  */
 #define PAGE_NONE	__pgprot(_PAGE_BASE)
 #define PAGE_SHARED	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
-#define PAGE_SHARED_X	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | _PAGE_EXEC)
-#define PAGE_COPY	__pgprot(_PAGE_BASE | _PAGE_USER)
-#define PAGE_COPY_X	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
-#define PAGE_READONLY	__pgprot(_PAGE_BASE | _PAGE_USER)
-#define PAGE_READONLY_X	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
+#define PAGE_SHARED_X	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \
+				 _PAGE_EXEC)
+#define PAGE_COPY	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
+#define PAGE_COPY_X	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
+				 _PAGE_EXEC)
+#define PAGE_READONLY	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
+#define PAGE_READONLY_X	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
+				 _PAGE_EXEC)
 
 #define __P000	PAGE_NONE
 #define __P001	PAGE_READONLY