Date: Wed, 26 Nov 2008 15:02:20 +0100
From: Ingo Molnar <mingo@elte.hu>
To: eranian@googlemail.com
Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org, x86@kernel.org,
       andi@firstfloor.org, eranian@gmail.com, sfr@canb.auug.org.au
Subject: Re: [patch 20/24] perfmon: system calls interface
Message-ID: <20081126140220.GD6562@elte.hu>
References: <492d0c0b.170e660a.15ba.ffffdabf@mx.google.com>
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* eranian@googlemail.com <eranian@googlemail.com> wrote:

> +
> +/*
> + * unlike the other perfmon system calls, this one returns a file descriptor
> + * or a value < 0 in case of error, very much like open() or socket()
> + */
> +asmlinkage long sys_pfm_create(int flags, struct pfarg_sinfo __user *ureq)
> +{
> +	struct pfm_context *new_ctx;
> +	struct pfarg_sinfo sif;
> +	int ret;
> +
> +	PFM_DBG("flags=0x%x sif=%p", flags, ureq);
> +
> +	if (perfmon_disabled)
> +		return -ENOSYS;
> +
> +	if (flags) {
> +		PFM_DBG("no flags accepted yet");
> +		return -EINVAL;

the canonical return code for non-yet-supported flags is not -EINVAL 
but -ENOSYS.

	Ingo
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