linux-kernel - RE: [PATCH] arm: always update thread

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Date:   Tue, 27 Nov 2018 15:48:52 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Russell King - ARM Linux' <linux@...linux.org.uk>,
        Rafael David Tinoco <rafael.tinoco@...aro.org>
CC:     Vladimir Murzin <vladimir.murzin@....com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Timothy E Baldwin <T.E.Baldwin99@...bers.leeds.ac.uk>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH] arm: always update thread_info->syscall

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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