From: Martin Schwidefsky Date: Fri, 24 Feb 2017 06:43:51 +0000 (+0100) Subject: s390: TASK_SIZE for kernel threads X-Git-Tag: Ubuntu-4.10.0-14.16~68 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=45b8e4b1e7665f2b35b7e611bba5735a7fd31a89;p=mirror_ubuntu-zesty-kernel.git s390: TASK_SIZE for kernel threads BugLink: http://bugs.launchpad.net/bugs/1673118 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 Signed-off-by: Greg Kroah-Hartman Signed-off-by: Tim Gardner --- diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h index 6bca916a5ba0..71cac7c43c4b 100644 --- a/arch/s390/include/asm/processor.h +++ b/arch/s390/include/asm/processor.h @@ -89,7 +89,8 @@ 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)