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

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Message-ID: <50CFA3C1.3040004@tilera.com>
Date:	Mon, 17 Dec 2012 17:59:13 -0500
From:	Chris Metcalf <cmetcalf@...era.com>
To:	Simon Marchi <simon.marchi@...ymtl.ca>
CC:	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] arch/tile: implement user_regset interface on tilegx

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.

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.

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

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