Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6

[sfrench/cifs-2.6.git] / arch / s390 / include / asm / mmu_context.h

diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index 4c2fbf48c9c43fe2fa0a7384bc55c576d6dfc23c..28ec870655af01fba9750fbc1d9e3105f41579fc 100644 (file)
--- 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));