[PATCH] arm: always update thread_info->syscall

[David.Laight@ACULAB.COM (David Laight)]

From: Russell King - ARM Linux
> Sent: 27 November 2018 15:36
...
> There appears to be no documentation at all of this interface, so there
> is no definition of how it is supposed to work or what it is supposed
> to expose beyond what little information is in the original patch:
> 
>   http://lkml.iu.edu/hypermail/linux/kernel/0807.2/0577.html
> 
>    This adds /proc/PID/syscall and /proc/PID/task/TID/syscall magic files.
>    These use task_current_syscall() to show the task's current system call
>    number and argument registers, stack pointer and PC. For a task blocked
>    but not in a syscall, the file shows "-1" in place of the syscall number,
>    followed by only the SP and PC. For a task that's not blocked, it shows
>    "running".

I 'like' the way the columns for sp and pc jump about ...

	David

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