linux-kernel - Re: [PATCH] tracehook: add some self tests

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Message-Id: <20100215203323.989DB1AD@magilla.sf.frob.com>
Date:	Mon, 15 Feb 2010 12:33:23 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tracehook: add some self tests

> is there some task available while the kernel is initializing ?  i.e.
> the test is compiled in ?
> 
> if current is valid, i'll just [ab]use that ...

I don't think you can win with any kind of abuse on ia64.  (For other
machines that only test the compat state of the task, any task will
do--though perhaps only test half the code.)  AFAICT, on ia64 only a real
empirical test can work at all.  That is, you must really be referring to a
task and its task_pt_regs() when that task really has entered the kernel
for a syscall.

Thanks,
Roland
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