These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / s390 / include / asm / pgalloc.h

diff --git a/kernel/arch/s390/include/asm/pgalloc.h b/kernel/arch/s390/include/asm/pgalloc.h
index 7b7858f..d7cc79f 100644 (file)
--- a/kernel/arch/s390/include/asm/pgalloc.h
+++ b/kernel/arch/s390/include/asm/pgalloc.h
@@ -100,12 +100,26 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 
 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 {
-       spin_lock_init(&mm->context.list_lock);
-       INIT_LIST_HEAD(&mm->context.pgtable_list);
-       INIT_LIST_HEAD(&mm->context.gmap_list);
-       return (pgd_t *) crst_table_alloc(mm);
+       unsigned long *table = crst_table_alloc(mm);
+
+       if (!table)
+               return NULL;
+       if (mm->context.asce_limit == (1UL << 31)) {
+               /* Forking a compat process with 2 page table levels */
+               if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
+                       crst_table_free(mm, table);
+                       return NULL;
+               }
+       }
+       return (pgd_t *) table;
+}
+
+static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
+{
+       if (mm->context.asce_limit == (1UL << 31))
+               pgtable_pmd_page_dtor(virt_to_page(pgd));
+       crst_table_free(mm, (unsigned long *) pgd);
 }
-#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
 
 static inline void pmd_populate(struct mm_struct *mm,
                                pmd_t *pmd, pgtable_t pte)