linux-kernel - Re: [PATCH 1/2] virtio tools: strip bad include-path from Makefile

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Message-ID: <CALkWK0k49QDWcupnhhgDh4WVP-xT1f2rvDkteChZyjWo48u9qw@mail.gmail.com>
Date:	Wed, 10 Jul 2013 17:50:04 +0530
From:	Ramkumar Ramachandra <artagnon@...il.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 1/2] virtio tools: strip bad include-path from Makefile

Michael S. Tsirkin wrote:
>> CFLAGS contains a mysterious "-I ../../usr/include", but no such path
>> exists in the linux tree.  The line was originally introduced in
>> 4e53f78e (tools/virtio: virtio_test tool, 2010-11-29), but no such path
>> existed in the tree even then.
>
> It exists if you do make headers_install.

I see.  Why do we need these (or userspace headers) when /include
exists in the linux tree though?

> So it's handy for old distos where userspace headers don't
> exist or are out of date.

I thought userspace headers (linux-kernel-headers package in my
distribution) are used for building kernel modules that exist as
independent projects outside the linux tree (?).
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