linux-kernel - Re: [PATCH] ARM: Wire up HAVE_SYSCALL

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Date:	Thu, 2 Feb 2012 15:41:11 -0800
From:	Roland McGrath <mcgrathr@...gle.com>
To:	Indan Zupancic <indan@....nu>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Takuo Koguchi <takuo.koguchi.sw@...achi.com>,
	linux-kernel@...r.kernel.org, masami.hiramatsu.pt@...achi.com,
	rostedt@...dmis.org, fweisbec@...il.com, mingo@...hat.com,
	jbaron@...hat.com, yrl.pp-manager.tt@...achi.com
Subject: Re: [PATCH] ARM: Wire up HAVE_SYSCALL_TRACEPOINTS

On Thu, Feb 2, 2012 at 3:38 PM, Indan Zupancic <indan@....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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