Linux-libre 4.8.2-gnupck-4.8.2-gnu

1 files changed, 32 insertions, 12 deletions

diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h
index 21ed7150f..5f9875980 100644
--- a/arch/mips/include/asm/page.h
+++ b/arch/mips/include/asm/page.h
@@ -162,16 +162,34 @@ typedef struct { unsigned long pgprot; } pgprot_t;
 /*
  * __pa()/__va() should be used only during mem init.
  */
-#ifdef CONFIG_64BIT
-#define __pa(x)								\
-({									\
-    unsigned long __x = (unsigned long)(x);				\
-    __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x);			\
-})
-#else
-#define __pa(x)								\
-    ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
-#endif
+static inline unsigned long ___pa(unsigned long x)
+{
+	if (IS_ENABLED(CONFIG_64BIT)) {
+		/*
+		 * For MIPS64 the virtual address may either be in one of
+		 * the compatibility segements ckseg0 or ckseg1, or it may
+		 * be in xkphys.
+		 */
+		return x < CKSEG0 ? XPHYSADDR(x) : CPHYSADDR(x);
+	}
+
+	if (!IS_ENABLED(CONFIG_EVA)) {
+		/*
+		 * We're using the standard MIPS32 legacy memory map, ie.
+		 * the address x is going to be in kseg0 or kseg1. We can
+		 * handle either case by masking out the desired bits using
+		 * CPHYSADDR.
+		 */
+		return CPHYSADDR(x);
+	}
+
+	/*
+	 * EVA is in use so the memory map could be anything, making it not
+	 * safe to just mask out bits.
+	 */
+	return x - PAGE_OFFSET + PHYS_OFFSET;
+}
+#define __pa(x)		___pa((unsigned long)(x))
 #define __va(x)		((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
 #include <asm/io.h>
 
@@ -229,8 +247,10 @@ extern int __virt_addr_valid(const volatile void *kaddr);
 #define virt_addr_valid(kaddr)						\
 	__virt_addr_valid((const volatile void *) (kaddr))
 
-#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
-				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+#define VM_DATA_DEFAULT_FLAGS \
+	(VM_READ | VM_WRITE | \
+	 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
+	 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 
 #define UNCAC_ADDR(addr)	((addr) - PAGE_OFFSET + UNCAC_BASE)
 #define CAC_ADDR(addr)		((addr) - UNCAC_BASE + PAGE_OFFSET)