From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1752599AbbICS5i (ORCPT <rfc822;w@1wt.eu>);
	Thu, 3 Sep 2015 14:57:38 -0400
Received: from mga14.intel.com ([192.55.52.115]:30903 "EHLO mga14.intel.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1751542AbbICS5d (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Thu, 3 Sep 2015 14:57:33 -0400
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.17,463,1437462000"; 
   d="scan'208";a="761793773"
From: Andi Kleen <andi@firstfloor.org>
To: Kenth Eriksson <kenth.eriksson@transmode.com>
Cc: "linux-kernel\@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: perf fails to mmap data file (JFFS2)
References: <1441266585059.29731@transmode.com>
Date: Thu, 03 Sep 2015 11:57:32 -0700
In-Reply-To: <1441266585059.29731@transmode.com> (Kenth Eriksson's message of
	"Thu, 3 Sep 2015 07:49:45 +0000")
Message-ID: <87d1xz49gj.fsf@tassilo.jf.intel.com>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Kenth Eriksson <kenth.eriksson@transmode.com> writes:

> perf on 4.1 fails to mmap the perf data file (in
> __perf_session__process_events) with error code 22 (invalid
> argument). I believe the JFFS2 file system does not support PROT_READ
> and MAP_SHARED. How can this be fixed? Can we change from MAP_SHARED
> to MAP_PRIVATE, or is there a reason to make it shared?

MAP_PRIVATE should be fine.

-Andi