[S390] implement is_compat_task

Implement is_compat_task and use it all over the place.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index e008d236cc15..f4558ccf02b9 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -28,6 +28,7 @@
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <asm/pgalloc.h>
+#include <asm/compat.h>
 
 /*
  * Top of mmap area (just below the process stack).
@@ -55,7 +56,7 @@ static inline int mmap_is_legacy(void)
         /*
          * Force standard allocation for 64 bit programs.
          */
-        if (!test_thread_flag(TIF_31BIT))
+        if (!is_compat_task())
                 return 1;
 #endif
         return sysctl_legacy_va_layout ||
@@ -91,7 +92,7 @@ EXPORT_SYMBOL_GPL(arch_pick_mmap_layout);
 
 int s390_mmap_check(unsigned long addr, unsigned long len)
 {
-        if (!test_thread_flag(TIF_31BIT) &&
+        if (!is_compat_task() &&
             len >= TASK_SIZE && TASK_SIZE < (1UL << 53))
                 return crst_table_upgrade(current->mm, 1UL << 53);
         return 0;
@@ -108,8 +109,7 @@ s390_get_unmapped_area(struct file *filp, unsigned long addr,
         area = arch_get_unmapped_area(filp, addr, len, pgoff, flags);
         if (!(area & ~PAGE_MASK))
                 return area;
-        if (area == -ENOMEM &&
-            !test_thread_flag(TIF_31BIT) && TASK_SIZE < (1UL << 53)) {
+        if (area == -ENOMEM && !is_compat_task() && TASK_SIZE < (1UL << 53)) {
                 /* Upgrade the page table to 4 levels and retry. */
                 rc = crst_table_upgrade(mm, 1UL << 53);
                 if (rc)
@@ -131,8 +131,7 @@ s390_get_unmapped_area_topdown(struct file *filp, const unsigned long addr,
         area = arch_get_unmapped_area_topdown(filp, addr, len, pgoff, flags);
         if (!(area & ~PAGE_MASK))
                 return area;
-        if (area == -ENOMEM &&
-            !test_thread_flag(TIF_31BIT) && TASK_SIZE < (1UL << 53)) {
+        if (area == -ENOMEM && !is_compat_task() && TASK_SIZE < (1UL << 53)) {
                 /* Upgrade the page table to 4 levels and retry. */
                 rc = crst_table_upgrade(mm, 1UL << 53);
                 if (rc)