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From: Roland McGrath <mcgrathr@google.com>
Date: Thu, 2 Feb 2012 15:41:11 -0800
Message-ID: <CAB=4xhpP_=2UGnTi=max3rz7WSEbmfr14EgV_UA+VR9aby0kpA@mail.gmail.com>
Subject: Re: [PATCH] ARM: Wire up HAVE_SYSCALL_TRACEPOINTS
To: Indan Zupancic <indan@nul.nu>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>,
        Takuo Koguchi <takuo.koguchi.sw@hitachi.com>,
        linux-kernel@vger.kernel.org, masami.hiramatsu.pt@hitachi.com,
        rostedt@goodmis.org, fweisbec@gmail.com, mingo@redhat.com,
        jbaron@redhat.com, yrl.pp-manager.tt@hitachi.com
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On Thu, Feb 2, 2012 at 3:38 PM, Indan Zupancic <indan@nul.nu> wrote:
> It was my impression that thread_info->syscall is only set in the ptrace path.

The asm-generic/syscall.h kerneldoc says these functions should only be
used in the trace/audit path, not the fast path.  I honestly don't recall
any more why I made that a requirement of the interface, but some machines
having this sort of constraint was probably it.


Thanks,
Roland
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