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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-02-24 06:43:51 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-15 02:02:41 (GMT) |
| commit | 9d38fd6a4f6c097b32128995a260a55351dc7667 (patch) | |
| tree | 9463205a9316699906567f9718a421dba2c86ad5 /arch/s390 | |
| parent | dc31841fcdce435ed88f87489f9ab09b48b43505 (diff) | |
| download | linux-9d38fd6a4f6c097b32128995a260a55351dc7667.tar.xz | |
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/processor.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h index 602af69..6bcbbec 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) |