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

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Date:	Wed, 10 Jul 2013 15:42:53 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Ramkumar Ramachandra <artagnon@...il.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

On Wed, Jul 10, 2013 at 05:50:04PM +0530, Ramkumar Ramachandra wrote:
> 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?

This is usespace code so it needs the cleaned-up version from
usr/include, not the internal kernel one.

> > 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 exist or are out of date.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 (?).

userspace headers are for userspace, not for external modules.
I don't know what does your distro puts in a linux-kernel-headers
package.

-- 
MST
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