5 files changed, 78 insertions, 51 deletions

diff --git a/arch/sparc/include/asm/mmu_context_64.h b/arch/sparc/include/asm/mmu_context_64.h
index 7a8380c63aab..799e797c5cdd 100644
--- a/arch/sparc/include/asm/mmu_context_64.h
+++ b/arch/sparc/include/asm/mmu_context_64.h
@@ -185,6 +185,12 @@ static inline void finish_arch_post_lock_switch(void)
 	}
 }
 
+#define mm_untag_mask mm_untag_mask
+static inline unsigned long mm_untag_mask(struct mm_struct *mm)
+{
+       return -1UL >> adi_nbits();
+}
+
 #include <asm-generic/mmu_context.h>
 
 #endif /* !(__ASSEMBLY__) */
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 2dc8d4641734..5563efa1a19f 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -357,6 +357,42 @@ static inline pgprot_t pgprot_noncached(pgprot_t prot)
  */
 #define pgprot_noncached pgprot_noncached
 
+static inline unsigned long pte_dirty(pte_t pte)
+{
+	unsigned long mask;
+
+	__asm__ __volatile__(
+	"\n661:	mov		%1, %0\n"
+	"	nop\n"
+	"	.section	.sun4v_2insn_patch, \"ax\"\n"
+	"	.word		661b\n"
+	"	sethi		%%uhi(%2), %0\n"
+	"	sllx		%0, 32, %0\n"
+	"	.previous\n"
+	: "=r" (mask)
+	: "i" (_PAGE_MODIFIED_4U), "i" (_PAGE_MODIFIED_4V));
+
+	return (pte_val(pte) & mask);
+}
+
+static inline unsigned long pte_write(pte_t pte)
+{
+	unsigned long mask;
+
+	__asm__ __volatile__(
+	"\n661:	mov		%1, %0\n"
+	"	nop\n"
+	"	.section	.sun4v_2insn_patch, \"ax\"\n"
+	"	.word		661b\n"
+	"	sethi		%%uhi(%2), %0\n"
+	"	sllx		%0, 32, %0\n"
+	"	.previous\n"
+	: "=r" (mask)
+	: "i" (_PAGE_WRITE_4U), "i" (_PAGE_WRITE_4V));
+
+	return (pte_val(pte) & mask);
+}
+
 #if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
 pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags);
 #define arch_make_huge_pte arch_make_huge_pte
@@ -418,28 +454,43 @@ static inline bool is_hugetlb_pte(pte_t pte)
 }
 #endif
 
+static inline pte_t __pte_mkhwwrite(pte_t pte)
+{
+	unsigned long val = pte_val(pte);
+
+	/*
+	 * Note: we only want to set the HW writable bit if the SW writable bit
+	 * and the SW dirty bit are set.
+	 */
+	__asm__ __volatile__(
+	"\n661:	or		%0, %2, %0\n"
+	"	.section	.sun4v_1insn_patch, \"ax\"\n"
+	"	.word		661b\n"
+	"	or		%0, %3, %0\n"
+	"	.previous\n"
+	: "=r" (val)
+	: "0" (val), "i" (_PAGE_W_4U), "i" (_PAGE_W_4V));
+
+	return __pte(val);
+}
+
 static inline pte_t pte_mkdirty(pte_t pte)
 {
-	unsigned long val = pte_val(pte), tmp;
+	unsigned long val = pte_val(pte), mask;
 
 	__asm__ __volatile__(
-	"\n661:	or		%0, %3, %0\n"
-	"	nop\n"
-	"\n662:	nop\n"
+	"\n661:	mov		%1, %0\n"
 	"	nop\n"
 	"	.section	.sun4v_2insn_patch, \"ax\"\n"
 	"	.word		661b\n"
-	"	sethi		%%uhi(%4), %1\n"
-	"	sllx		%1, 32, %1\n"
-	"	.word		662b\n"
-	"	or		%1, %%lo(%4), %1\n"
-	"	or		%0, %1, %0\n"
+	"	sethi		%%uhi(%2), %0\n"
+	"	sllx		%0, 32, %0\n"
 	"	.previous\n"
-	: "=r" (val), "=r" (tmp)
-	: "0" (val), "i" (_PAGE_MODIFIED_4U | _PAGE_W_4U),
-	  "i" (_PAGE_MODIFIED_4V | _PAGE_W_4V));
+	: "=r" (mask)
+	: "i" (_PAGE_MODIFIED_4U), "i" (_PAGE_MODIFIED_4V));
 
-	return __pte(val);
+	pte = __pte(val | mask);
+	return pte_write(pte) ? __pte_mkhwwrite(pte) : pte;
 }
 
 static inline pte_t pte_mkclean(pte_t pte)
@@ -481,7 +532,8 @@ static inline pte_t pte_mkwrite(pte_t pte)
 	: "=r" (mask)
 	: "i" (_PAGE_WRITE_4U), "i" (_PAGE_WRITE_4V));
 
-	return __pte(val | mask);
+	pte = __pte(val | mask);
+	return pte_dirty(pte) ? __pte_mkhwwrite(pte) : pte;
 }
 
 static inline pte_t pte_wrprotect(pte_t pte)
@@ -584,42 +636,6 @@ static inline unsigned long pte_young(pte_t pte)
 	return (pte_val(pte) & mask);
 }
 
-static inline unsigned long pte_dirty(pte_t pte)
-{
-	unsigned long mask;
-
-	__asm__ __volatile__(
-	"\n661:	mov		%1, %0\n"
-	"	nop\n"
-	"	.section	.sun4v_2insn_patch, \"ax\"\n"
-	"	.word		661b\n"
-	"	sethi		%%uhi(%2), %0\n"
-	"	sllx		%0, 32, %0\n"
-	"	.previous\n"
-	: "=r" (mask)
-	: "i" (_PAGE_MODIFIED_4U), "i" (_PAGE_MODIFIED_4V));
-
-	return (pte_val(pte) & mask);
-}
-
-static inline unsigned long pte_write(pte_t pte)
-{
-	unsigned long mask;
-
-	__asm__ __volatile__(
-	"\n661:	mov		%1, %0\n"
-	"	nop\n"
-	"	.section	.sun4v_2insn_patch, \"ax\"\n"
-	"	.word		661b\n"
-	"	sethi		%%uhi(%2), %0\n"
-	"	sllx		%0, 32, %0\n"
-	"	.previous\n"
-	: "=r" (mask)
-	: "i" (_PAGE_WRITE_4U), "i" (_PAGE_WRITE_4V));
-
-	return (pte_val(pte) & mask);
-}
-
 static inline unsigned long pte_exec(pte_t pte)
 {
 	unsigned long mask;
diff --git a/arch/sparc/include/asm/prom.h b/arch/sparc/include/asm/prom.h
index 587edb8b5a65..8184575b1336 100644
--- a/arch/sparc/include/asm/prom.h
+++ b/arch/sparc/include/asm/prom.h
@@ -19,11 +19,14 @@
 #include <linux/mutex.h>
 #include <linux/atomic.h>
 #include <linux/irqdomain.h>
+#include <linux/spinlock.h>
 
 #define of_compat_cmp(s1, s2, l)	strncmp((s1), (s2), (l))
 #define of_prop_cmp(s1, s2)		strcasecmp((s1), (s2))
 #define of_node_cmp(s1, s2)		strcmp((s1), (s2))
 
+extern raw_spinlock_t devtree_lock;
+
 struct of_irq_controller {
 	unsigned int	(*irq_build)(struct device_node *, unsigned int, void *);
 	void		*data;
diff --git a/arch/sparc/include/asm/smp_64.h b/arch/sparc/include/asm/smp_64.h
index e75783b6abc4..505b6700805d 100644
--- a/arch/sparc/include/asm/smp_64.h
+++ b/arch/sparc/include/asm/smp_64.h
@@ -49,7 +49,7 @@ int hard_smp_processor_id(void);
 
 void smp_fill_in_cpu_possible_map(void);
 void smp_fill_in_sib_core_maps(void);
-void cpu_play_dead(void);
+void __noreturn cpu_play_dead(void);
 
 void smp_fetch_global_regs(void);
 void smp_fetch_global_pmu(void);
diff --git a/arch/sparc/include/asm/uaccess_64.h b/arch/sparc/include/asm/uaccess_64.h
index 94266a5c5b04..b825a5dd0210 100644
--- a/arch/sparc/include/asm/uaccess_64.h
+++ b/arch/sparc/include/asm/uaccess_64.h
@@ -8,8 +8,10 @@
 
 #include <linux/compiler.h>
 #include <linux/string.h>
+#include <linux/mm_types.h>
 #include <asm/asi.h>
 #include <asm/spitfire.h>
+#include <asm/pgtable.h>
 
 #include <asm/processor.h>
 #include <asm-generic/access_ok.h>