linux-kernel - Re: [PATCH 1/3] arch/tile: implement user

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Message-ID: <CAFXXi0m3rHg7P+GetLKv_cwp5+c5xsmbJ8LM5CTLGT39JhBmzA@mail.gmail.com>
Date:	Mon, 17 Dec 2012 17:07:30 -0500
From:	Simon Marchi <simon.marchi@...ymtl.ca>
To:	Chris Metcalf <cmetcalf@...era.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] arch/tile: implement user_regset interface on tilegx

On Mon, Dec 17, 2012 at 12:06 PM, Chris Metcalf <cmetcalf@...era.com> wrote:
> On 12/14/2012 11:34 PM, Simon Marchi wrote:
>> This is an implementation of user_regset for the tilegx architecture. It
>> reuses the basic blocks that were already there.
>
> Thanks, Simon!  A couple of comments:
>
> I encourage you to respin this for tilepro as well as tilegx, since it's going to be trivial to make it happen.  Just take away all yours ifdefs, and use #include <arch/chip.h> and CHIP_ARCH_NAME instead of the string "tilegx".  It's worth it just to avoid the ifdefs in the code :-)

Ok, I will send a v2 with this soon.

> I think with this support added, we have all the prerequisites to add "select HAVE_ARCH_TRACEHOOK" under "config TILE" in arch/tile/Kconfig, so we might as well do that too.  That will enable PTRACE_GETREGSET and PTRACE_SETREGSET, as well as /proc/PID/syscall, so why not?

This is indeed my objective ;), and it is an intermediate objective to
add support for HAVE_SYSCALL_TRACEPOINTS. If we look at arch/Kconfig,
just above HAVE_ARCH_TRACEHOOK, we still have

TIF_SYSCALL_TRACE       calls tracehook_report_syscall_{entry,exit}
TIF_NOTIFY_RESUME       calls tracehook_notify_resume()
signal delivery         calls tracehook_signal_handler()

that we need to implement.

> --
> Chris Metcalf, Tilera Corp.
> http://www.tilera.com
>
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