Commit fb94a687 authored Feb 24, 2017 by Martin Schwidefsky

s390: TASK_SIZE for kernel threads



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.

Cc: <stable@vger.kernel.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent 27937843

arch/s390/include/asm/processor.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -91,7 +91,8 @@ extern void execve_tail(void);
		* User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
		*/

		#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)