linux-kernel - Re: perf build broke by list

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Date:	Tue, 10 Aug 2010 14:44:45 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Chris Metcalf <cmetcalf@...era.com>
Cc:	David Miller <davem@...emloft.net>, willy@...ux.intel.com,
	linux-kernel@...r.kernel.org
Subject: Re: perf build broke by list_head changes...

On Tue, Aug 10, 2010 at 08:36:46AM -0400, Chris Metcalf wrote:
> On 8/10/2010 2:57 AM, David Miller wrote:
> > Commit:
> >
> > commit de5d9bf6541736dc7ad264d2b5cc99bc1b2ad958
> > Author: Chris Metcalf <cmetcalf@...era.com>
> > Date:   Fri Jul 2 13:41:14 2010 -0400
> >
> >     Move list types from <linux/list.h> to <linux/types.h>.
> >
> > broke the build of 'perf'.
> >
> > If you move "struct list_head" into types.h, this means perf stops
> > building because it depends upon being able to include linux/list.h
> > from a userland application and at the same time be able to get the
> > basic data types without defining __KERNEL__ or similar.
> >   
> 
> If necessary, it certainly would be easy to move the list.h types to
> follow struct ustat, then bump the #endif up above them with a comment
> about the perf system's use of them.
> 
> I'm confused, though, since <linux/list.h> isn't installed by
> headers_install, so how was perf finding that definition before anyway?

kernel devs usually tell people not to use kernel
headers direct.
But perf does so a lot.

$ cd tools/perf/util; git grep '../../..'
header.h:#include "../../../include/linux/perf_event.h"
include/asm/byteorder.h:#include "../../../../include/linux/swab.h"
include/linux/hash.h:#include "../../../../include/linux/hash.h"
include/linux/list.h:#include "../../../../include/linux/list.h"
include/linux/poison.h:#include "../../../../include/linux/poison.h"
include/linux/rbtree.h:#include "../../../../include/linux/rbtree.h"
parse-events.c:#include "../../../include/linux/hw_breakpoint.h"
parse-events.c: snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
parse-events.c: snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
session.h:#include "../../../include/linux/perf_event.h"
util.h:#include "../../../include/linux/magic.h"
util.h:#include "../../../include/linux/stringify.h"

IMO the patch that moves list_head to types.h is fine.
And perf needs to learn good manner with respect to
kernel headers.

	Sam
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