Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6

* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
  [S390] mm: fix mmu_gather rework
  [S390] mm: fix storage key handling

2 files changed, 24 insertions, 15 deletions

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index c4773a2ef3d3..e4efacfe1b63 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -577,16 +577,16 @@ static inline void pgste_set_unlock(pte_t *ptep, pgste_t pgste)
 static inline pgste_t pgste_update_all(pte_t *ptep, pgste_t pgste)
 {
 #ifdef CONFIG_PGSTE
-	unsigned long pfn, bits;
+	unsigned long address, bits;
 	unsigned char skey;
 
-	pfn = pte_val(*ptep) >> PAGE_SHIFT;
-	skey = page_get_storage_key(pfn);
+	address = pte_val(*ptep) & PAGE_MASK;
+	skey = page_get_storage_key(address);
 	bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED);
 	/* Clear page changed & referenced bit in the storage key */
 	if (bits) {
 		skey ^= bits;
-		page_set_storage_key(pfn, skey, 1);
+		page_set_storage_key(address, skey, 1);
 	}
 	/* Transfer page changed & referenced bit to guest bits in pgste */
 	pgste_val(pgste) |= bits << 48;		/* RCP_GR_BIT & RCP_GC_BIT */
@@ -628,16 +628,16 @@ static inline pgste_t pgste_update_young(pte_t *ptep, pgste_t pgste)
 static inline void pgste_set_pte(pte_t *ptep, pgste_t pgste)
 {
 #ifdef CONFIG_PGSTE
-	unsigned long pfn;
+	unsigned long address;
 	unsigned long okey, nkey;
 
-	pfn = pte_val(*ptep) >> PAGE_SHIFT;
-	okey = nkey = page_get_storage_key(pfn);
+	address = pte_val(*ptep) & PAGE_MASK;
+	okey = nkey = page_get_storage_key(address);
 	nkey &= ~(_PAGE_ACC_BITS | _PAGE_FP_BIT);
 	/* Set page access key and fetch protection bit from pgste */
 	nkey |= (pgste_val(pgste) & (RCP_ACC_BITS | RCP_FP_BIT)) >> 56;
 	if (okey != nkey)
-		page_set_storage_key(pfn, nkey, 1);
+		page_set_storage_key(address, nkey, 1);
 #endif
 }
 
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 14c6fae6fe6b..b09763fe5da1 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -71,12 +71,15 @@ static void rcu_table_freelist_callback(struct rcu_head *head)
 
 void rcu_table_freelist_finish(void)
 {
-	struct rcu_table_freelist *batch = __get_cpu_var(rcu_table_freelist);
+	struct rcu_table_freelist **batchp = &get_cpu_var(rcu_table_freelist);
+	struct rcu_table_freelist *batch = *batchp;
 
 	if (!batch)
-		return;
+		goto out;
 	call_rcu(&batch->rcu, rcu_table_freelist_callback);
-	__get_cpu_var(rcu_table_freelist) = NULL;
+	*batchp = NULL;
+out:
+	put_cpu_var(rcu_table_freelist);
 }
 
 static void smp_sync(void *arg)
@@ -141,20 +144,23 @@ void crst_table_free_rcu(struct mm_struct *mm, unsigned long *table)
 {
 	struct rcu_table_freelist *batch;
 
+	preempt_disable();
 	if (atomic_read(&mm->mm_users) < 2 &&
 	    cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) {
 		crst_table_free(mm, table);
-		return;
+		goto out;
 	}
 	batch = rcu_table_freelist_get(mm);
 	if (!batch) {
 		smp_call_function(smp_sync, NULL, 1);
 		crst_table_free(mm, table);
-		return;
+		goto out;
 	}
 	batch->table[--batch->crst_index] = table;
 	if (batch->pgt_index >= batch->crst_index)
 		rcu_table_freelist_finish();
+out:
+	preempt_enable();
 }
 
 #ifdef CONFIG_64BIT
@@ -323,16 +329,17 @@ void page_table_free_rcu(struct mm_struct *mm, unsigned long *table)
 	struct page *page;
 	unsigned long bits;
 
+	preempt_disable();
 	if (atomic_read(&mm->mm_users) < 2 &&
 	    cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) {
 		page_table_free(mm, table);
-		return;
+		goto out;
 	}
 	batch = rcu_table_freelist_get(mm);
 	if (!batch) {
 		smp_call_function(smp_sync, NULL, 1);
 		page_table_free(mm, table);
-		return;
+		goto out;
 	}
 	bits = (mm->context.has_pgste) ? 3UL : 1UL;
 	bits <<= (__pa(table) & (PAGE_SIZE - 1)) / 256 / sizeof(unsigned long);
@@ -345,6 +352,8 @@ void page_table_free_rcu(struct mm_struct *mm, unsigned long *table)
 	batch->table[batch->pgt_index++] = table;
 	if (batch->pgt_index >= batch->crst_index)
 		rcu_table_freelist_finish();
+out:
+	preempt_enable();
 }
 
 /*