s390: TASK_SIZE for kernel threads

commit fb94a687d96c570d46332a4a890f1dcb7310e643 upstream.

Return a sensible value if TASK_SIZE if called from a kernel thread.

This gets us around an issue with copy_mount_options that does a magic
size calculation "TASK_SIZE - (unsigned long)data" while in a kernel
thread and data pointing to kernel space.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 83c85c217f5ca3faa6e1dcecbe58caabb90c6941..52ef30cfedf00023e6f8aadd1b02adef5f8c1db2 100644 (file)
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -48,7 +48,8 @@ extern void execve_tail(void);
 
 #else /* CONFIG_64BIT */
 
-#define TASK_SIZE_OF(tsk)      ((tsk)->mm->context.asce_limit)
+#define TASK_SIZE_OF(tsk)      ((tsk)->mm ? \
+                                (tsk)->mm->context.asce_limit : TASK_MAX_SIZE)
 #define TASK_UNMAPPED_BASE     (test_thread_flag(TIF_31BIT) ? \
                                        (1UL << 30) : (1UL << 41))
 #define TASK_SIZE              TASK_SIZE_OF(current)