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

* 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6:
  [S390] s390: Fix build for !CONFIG_S390_GUEST + CONFIG_VIRTIO_CONSOLE
  [S390] No more 4kb stacks.
  [S390] Change default IPL method to IPL_VM.
  [S390] tape: disable interrupts in tape_open and tape_release
  [S390] appldata: unsigned ops->size cannot be negative
  [S390] tape block: complete request with correct locking
  [S390] Fix sysdev class file creation.
  [S390] pgtables: Fix race in enable_sie vs. page table ops
  [S390] qdio: remove incorrect memset
  [S390] qdio: prevent double qdio shutdown in case of I/O errors

9 files changed, 48 insertions, 47 deletions

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 70b7645ce74..8116a3328a1 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -241,19 +241,17 @@ config PACK_STACK
 	  Say Y if you are unsure.
 
 config SMALL_STACK
-	bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb"
-	depends on PACK_STACK && !LOCKDEP
+	bool "Use 8kb for kernel stack instead of 16kb"
+	depends on PACK_STACK && 64BIT && !LOCKDEP
 	help
 	  If you say Y here and the compiler supports the -mkernel-backchain
-	  option the kernel will use a smaller kernel stack size. For 31 bit
-	  the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb
-	  instead of 16kb. This allows to run more thread on a system and
-	  reduces the pressure on the memory management for higher order
-	  page allocations.
+	  option the kernel will use a smaller kernel stack size. The reduced
+	  size is 8kb instead of 16kb. This allows to run more threads on a
+	  system and reduces the pressure on the memory management for higher
+	  order page allocations.
 
 	  Say N if you are unsure.
 
-
 config CHECK_STACK
 	bool "Detect kernel stack overflow"
 	help
@@ -384,7 +382,7 @@ config IPL
 choice
 	prompt "IPL method generated into head.S"
 	depends on IPL
-	default IPL_TAPE
+	default IPL_VM
 	help
 	  Select "tape" if you want to IPL the image from a Tape.
 
diff --git a/arch/s390/appldata/appldata_base.c b/arch/s390/appldata/appldata_base.c
index a7f8979fb92..a06a47cdd5e 100644
--- a/arch/s390/appldata/appldata_base.c
+++ b/arch/s390/appldata/appldata_base.c
@@ -424,7 +424,7 @@ out:
  */
 int appldata_register_ops(struct appldata_ops *ops)
 {
-	if ((ops->size > APPLDATA_MAX_REC_SIZE) || (ops->size < 0))
+	if (ops->size > APPLDATA_MAX_REC_SIZE)
 		return -EINVAL;
 
 	ops->ctl_table = kzalloc(4 * sizeof(struct ctl_table), GFP_KERNEL);
diff --git a/arch/s390/include/asm/kvm_virtio.h b/arch/s390/include/asm/kvm_virtio.h
index 146100224de..c13568b9351 100644
--- a/arch/s390/include/asm/kvm_virtio.h
+++ b/arch/s390/include/asm/kvm_virtio.h
@@ -52,7 +52,7 @@ struct kvm_vqconfig {
 
 #ifdef __KERNEL__
 /* early virtio console setup */
-#ifdef CONFIG_VIRTIO_CONSOLE
+#ifdef CONFIG_S390_GUEST
 extern void s390_virtio_console_init(void);
 #else
 static inline void s390_virtio_console_init(void)
diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h
index 5dd5e7b3476..d2b4ff83147 100644
--- a/arch/s390/include/asm/mmu.h
+++ b/arch/s390/include/asm/mmu.h
@@ -7,7 +7,8 @@ typedef struct {
 	unsigned long asce_bits;
 	unsigned long asce_limit;
 	int noexec;
-	int pgstes;
+	int has_pgste;	 /* The mmu context has extended page tables */
+	int alloc_pgste; /* cloned contexts will have extended page tables */
 } mm_context_t;
 
 #endif
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index 4c2fbf48c9c..28ec870655a 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -20,12 +20,25 @@ static inline int init_new_context(struct task_struct *tsk,
 #ifdef CONFIG_64BIT
 	mm->context.asce_bits |= _ASCE_TYPE_REGION3;
 #endif
-	if (current->mm->context.pgstes) {
+	if (current->mm->context.alloc_pgste) {
+		/*
+		 * alloc_pgste indicates, that any NEW context will be created
+		 * with extended page tables. The old context is unchanged. The
+		 * page table allocation and the page table operations will
+		 * look at has_pgste to distinguish normal and extended page
+		 * tables. The only way to create extended page tables is to
+		 * set alloc_pgste and then create a new context (e.g. dup_mm).
+		 * The page table allocation is called after init_new_context
+		 * and if has_pgste is set, it will create extended page
+		 * tables.
+		 */
 		mm->context.noexec = 0;
-		mm->context.pgstes = 1;
+		mm->context.has_pgste = 1;
+		mm->context.alloc_pgste = 1;
 	} else {
 		mm->context.noexec = s390_noexec;
-		mm->context.pgstes = 0;
+		mm->context.has_pgste = 0;
+		mm->context.alloc_pgste = 0;
 	}
 	mm->context.asce_limit = STACK_TOP_MAX;
 	crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 1a928f84afd..7fc76133b3e 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -679,7 +679,7 @@ static inline void pmd_clear(pmd_t *pmd)
 
 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 {
-	if (mm->context.pgstes)
+	if (mm->context.has_pgste)
 		ptep_rcp_copy(ptep);
 	pte_val(*ptep) = _PAGE_TYPE_EMPTY;
 	if (mm->context.noexec)
@@ -763,7 +763,7 @@ static inline int kvm_s390_test_and_clear_page_dirty(struct mm_struct *mm,
 	struct page *page;
 	unsigned int skey;
 
-	if (!mm->context.pgstes)
+	if (!mm->context.has_pgste)
 		return -EINVAL;
 	rcp_lock(ptep);
 	pgste = (unsigned long *) (ptep + PTRS_PER_PTE);
@@ -794,7 +794,7 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
 	int young;
 	unsigned long *pgste;
 
-	if (!vma->vm_mm->context.pgstes)
+	if (!vma->vm_mm->context.has_pgste)
 		return 0;
 	physpage = pte_val(*ptep) & PAGE_MASK;
 	pgste = (unsigned long *) (ptep + PTRS_PER_PTE);
@@ -844,7 +844,7 @@ static inline void __ptep_ipte(unsigned long address, pte_t *ptep)
 static inline void ptep_invalidate(struct mm_struct *mm,
 				   unsigned long address, pte_t *ptep)
 {
-	if (mm->context.pgstes) {
+	if (mm->context.has_pgste) {
 		rcp_lock(ptep);
 		__ptep_ipte(address, ptep);
 		ptep_rcp_copy(ptep);
diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h
index de3fad60c68..c1eaf9604da 100644
--- a/arch/s390/include/asm/thread_info.h
+++ b/arch/s390/include/asm/thread_info.h
@@ -15,13 +15,8 @@
  * Size of kernel stack for each process
  */
 #ifndef __s390x__
-#ifndef __SMALL_STACK
 #define THREAD_ORDER 1
 #define ASYNC_ORDER  1
-#else
-#define THREAD_ORDER 0
-#define ASYNC_ORDER  0
-#endif
 #else /* __s390x__ */
 #ifndef __SMALL_STACK
 #define THREAD_ORDER 2
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 9e8b1f9b8f4..b5595688a47 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -1119,9 +1119,7 @@ out:
 	return rc;
 }
 
-static ssize_t __ref rescan_store(struct sys_device *dev,
-				  struct sysdev_attribute *attr,
-				  const char *buf,
+static ssize_t __ref rescan_store(struct sysdev_class *class, const char *buf,
 				  size_t count)
 {
 	int rc;
@@ -1129,12 +1127,10 @@ static ssize_t __ref rescan_store(struct sys_device *dev,
 	rc = smp_rescan_cpus();
 	return rc ? rc : count;
 }
-static SYSDEV_ATTR(rescan, 0200, NULL, rescan_store);
+static SYSDEV_CLASS_ATTR(rescan, 0200, NULL, rescan_store);
 #endif /* CONFIG_HOTPLUG_CPU */
 
-static ssize_t dispatching_show(struct sys_device *dev,
-				struct sysdev_attribute *attr,
-				char *buf)
+static ssize_t dispatching_show(struct sysdev_class *class, char *buf)
 {
 	ssize_t count;
 
@@ -1144,9 +1140,8 @@ static ssize_t dispatching_show(struct sys_device *dev,
 	return count;
 }
 
-static ssize_t dispatching_store(struct sys_device *dev,
-				 struct sysdev_attribute *attr,
-				 const char *buf, size_t count)
+static ssize_t dispatching_store(struct sysdev_class *dev, const char *buf,
+				 size_t count)
 {
 	int val, rc;
 	char delim;
@@ -1168,7 +1163,8 @@ out:
 	put_online_cpus();
 	return rc ? rc : count;
 }
-static SYSDEV_ATTR(dispatching, 0644, dispatching_show, dispatching_store);
+static SYSDEV_CLASS_ATTR(dispatching, 0644, dispatching_show,
+			 dispatching_store);
 
 static int __init topology_init(void)
 {
@@ -1178,13 +1174,11 @@ static int __init topology_init(void)
 	register_cpu_notifier(&smp_cpu_nb);
 
 #ifdef CONFIG_HOTPLUG_CPU
-	rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
-			       &attr_rescan.attr);
+	rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_rescan);
 	if (rc)
 		return rc;
 #endif
-	rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
-			       &attr_dispatching.attr);
+	rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_dispatching);
 	if (rc)
 		return rc;
 	for_each_present_cpu(cpu) {
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 3d98ba82ea6..ef3635b52fc 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -169,7 +169,7 @@ unsigned long *page_table_alloc(struct mm_struct *mm)
 	unsigned long *table;
 	unsigned long bits;
 
-	bits = (mm->context.noexec || mm->context.pgstes) ? 3UL : 1UL;
+	bits = (mm->context.noexec || mm->context.has_pgste) ? 3UL : 1UL;
 	spin_lock(&mm->page_table_lock);
 	page = NULL;
 	if (!list_empty(&mm->context.pgtable_list)) {
@@ -186,7 +186,7 @@ unsigned long *page_table_alloc(struct mm_struct *mm)
 		pgtable_page_ctor(page);
 		page->flags &= ~FRAG_MASK;
 		table = (unsigned long *) page_to_phys(page);
-		if (mm->context.pgstes)
+		if (mm->context.has_pgste)
 			clear_table_pgstes(table);
 		else
 			clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE);
@@ -210,7 +210,7 @@ void page_table_free(struct mm_struct *mm, unsigned long *table)
 	struct page *page;
 	unsigned long bits;
 
-	bits = (mm->context.noexec || mm->context.pgstes) ? 3UL : 1UL;
+	bits = (mm->context.noexec || mm->context.has_pgste) ? 3UL : 1UL;
 	bits <<= (__pa(table) & (PAGE_SIZE - 1)) / 256 / sizeof(unsigned long);
 	page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
 	spin_lock(&mm->page_table_lock);
@@ -257,7 +257,7 @@ int s390_enable_sie(void)
 	struct mm_struct *mm, *old_mm;
 
 	/* Do we have pgstes? if yes, we are done */
-	if (tsk->mm->context.pgstes)
+	if (tsk->mm->context.has_pgste)
 		return 0;
 
 	/* lets check if we are allowed to replace the mm */
@@ -269,14 +269,14 @@ int s390_enable_sie(void)
 	}
 	task_unlock(tsk);
 
-	/* we copy the mm with pgstes enabled */
-	tsk->mm->context.pgstes = 1;
+	/* we copy the mm and let dup_mm create the page tables with_pgstes */
+	tsk->mm->context.alloc_pgste = 1;
 	mm = dup_mm(tsk);
-	tsk->mm->context.pgstes = 0;
+	tsk->mm->context.alloc_pgste = 0;
 	if (!mm)
 		return -ENOMEM;
 
-	/* Now lets check again if somebody attached ptrace etc */
+	/* Now lets check again if something happened */
 	task_lock(tsk);
 	if (!tsk->mm || atomic_read(&tsk->mm->mm_users) > 1 ||
 	    tsk->mm != tsk->active_mm || tsk->mm->ioctx_list) {