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

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Message-ID: <CAFXXi0=OJEnj6bDxagV0VyEW6EYXbL1mJgBGMOYz-jsyfa+JqQ@mail.gmail.com>
Date:	Mon, 17 Dec 2012 20:05:58 -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 5:59 PM, Chris Metcalf <cmetcalf@...era.com> wrote:
> On 12/17/2012 5:07 PM, Simon Marchi wrote:
>>> 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()
>
> I believe we do properly support TIF_SYSCALL_TRACE; see arch/tile/kernel/intvec_64.S.  Likewise TIF_NOTIFY_RESUME; see do_work_pending() in arch/tile/kernel/process.c.  And signal delivery seems to be handled in a platform-independent way now; see kernel/signal.c.

TIF_SYSCALL_TRACE is handled, but it doesn't call
tracehook_report_syscall_{entry,exit} as specified. The two others
seem handled like you said.

> My only comment on the revised patch is that I believe you should #include <arch/chip.h>, not <uapi/arch/chip.h>.  Source code (.c files) doesn't seem to use the <uapi/> prefix.

Oh, I didn't know the include path contained arch/tile/include/uapi
directly. Fixing it.
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