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>
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@ -91,7 +91,8 @@ extern void execve_tail(void);
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* User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
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*/
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#define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
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#define TASK_SIZE_OF(tsk) ((tsk)->mm ? \
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(tsk)->mm->context.asce_limit : TASK_MAX_SIZE)
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#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
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(1UL << 30) : (1UL << 41))
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#define TASK_SIZE TASK_SIZE_OF(current)
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