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

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Message-ID: <20100215193948.GA28419@redhat.com>
Date:	Mon, 15 Feb 2010 20:39:48 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Mike Frysinger <vapier@...too.org>
Cc:	Roland McGrath <roland@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tracehook: add some self tests

On 02/15, Mike Frysinger wrote:
>
> +static int __init syscall_test(void)
> +{
> +	struct pt_regs _regs, *regs = &_regs;
> +	long _args[8];
> +	long *args = _args + 1;
> +	long *sys_args[6], *sa;
> +	unsigned int i, n, s;
> +
> +	/*
> +	 * First find each system register in pt_regs.  We have to assume
> +	 * syscall_set_arguments() works with very basic arguments.
> +	 */
> +	pr_info("TEST: asm/syscall.h: arg offsets: { ");
> +
> +	for (s = 0; s < 6; ++s)
> +		args[s] = s;
> +	memset(regs, 0xad, sizeof(*regs));
> +	syscall_set_arguments(NULL, regs, 0, 6, args);
                              ^^^^

I am not sure ia64 can tolerate task == NULL. Hmm, even x86 checks
task_thread_info(task)->status.

Probably CONFIG_TRACEHOOK_SELF_TEST needs more attention ?

Otherwise, I convinced myself I understand what this code does, and
it looks good ;)

Oleg.

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