From fb94a687d96c570d46332a4a890f1dcb7310e643 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Fri, 24 Feb 2017 07:43:51 +0100 Subject: 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: Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/processor.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h index c57c5c2f2484..e4988710aa86 100644 --- a/arch/s390/include/asm/processor.h +++ b/arch/s390/include/asm/processor.h @@ -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) -- cgit v1.2.3-59-g8ed1b