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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2009-03-18 13:27:36 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-03-18 13:28:13 +0100
commitf481bfafd36e621d6cbc62d4b25f74811410aef7 (patch)
tree781f98037ec772f2b7d480d5642135f7c1ec8b89
parent2887fc5aa60803b9d6d38c79248805f08d8b0e28 (diff)
downloadop-kernel-dev-f481bfafd36e621d6cbc62d4b25f74811410aef7.zip
op-kernel-dev-f481bfafd36e621d6cbc62d4b25f74811410aef7.tar.gz
[S390] make page table walking more robust
Make page table walking on s390 more robust. The current code requires that the pgd/pud/pmd/pte loop is only done for address ranges that are below the end address of the last vma of the address space. But this is not always true, e.g. the generic page table walker does not guarantee this. Change TASK_SIZE/TASK_SIZE_OF to reflect the current size of the address space. This makes the generic page table walker happy but it breaks the upgrade of a 3 level page table to a 4 level page table. To make the upgrade work again another fix is required. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/include/asm/processor.h5
-rw-r--r--arch/s390/mm/mmap.c4
-rw-r--r--arch/s390/mm/pgtable.c2
3 files changed, 6 insertions, 5 deletions
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 066b995..db4523f 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -61,7 +61,7 @@ extern void print_cpu_info(struct cpuinfo_S390 *);
extern int get_cpu_capability(unsigned int *);
/*
- * User space process size: 2GB for 31 bit, 4TB for 64 bit.
+ * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
*/
#ifndef __s390x__
@@ -70,8 +70,7 @@ extern int get_cpu_capability(unsigned int *);
#else /* __s390x__ */
-#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk,TIF_31BIT) ? \
- (1UL << 31) : (1UL << 53))
+#define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
(1UL << 30) : (1UL << 41))
#define TASK_SIZE TASK_SIZE_OF(current)
diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index 5932a82..346dd0c 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -35,7 +35,7 @@
* Leave an at least ~128 MB hole.
*/
#define MIN_GAP (128*1024*1024)
-#define MAX_GAP (TASK_SIZE/6*5)
+#define MAX_GAP (STACK_TOP/6*5)
static inline unsigned long mmap_base(void)
{
@@ -46,7 +46,7 @@ static inline unsigned long mmap_base(void)
else if (gap > MAX_GAP)
gap = MAX_GAP;
- return TASK_SIZE - (gap & PAGE_MASK);
+ return STACK_TOP - (gap & PAGE_MASK);
}
static inline int mmap_is_legacy(void)
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 0767827..6b6ddc4 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -117,6 +117,7 @@ repeat:
crst_table_init(table, entry);
pgd_populate(mm, (pgd_t *) table, (pud_t *) pgd);
mm->pgd = (pgd_t *) table;
+ mm->task_size = mm->context.asce_limit;
table = NULL;
}
spin_unlock(&mm->page_table_lock);
@@ -154,6 +155,7 @@ void crst_table_downgrade(struct mm_struct *mm, unsigned long limit)
BUG();
}
mm->pgd = (pgd_t *) (pgd_val(*pgd) & _REGION_ENTRY_ORIGIN);
+ mm->task_size = mm->context.asce_limit;
crst_table_free(mm, (unsigned long *) pgd);
}
update_mm(mm, current);
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