linux-kernel - Re: [PATCH 09/11] tools/objtool: Copy hashtable.h into tools directory

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Date:	Wed, 9 Mar 2016 10:47:59 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
	Michal Marek <mmarek@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Pedro Alves <palves@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Bernd Petrovitsch <bernd@...rovitsch.priv.at>,
	Chris J Arges <chris.j.arges@...onical.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [PATCH 09/11] tools/objtool: Copy hashtable.h into tools
 directory


* Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> Copy hashtable.h from include/linux/tools.h.  It's needed by objtool in
> the next patch in the series.
> 
> Add some includes that it needs, and remove references to
> kernel-specific features like RCU and __read_mostly.
> 
> Also change some if its dependency headers' includes to use quotes
> instead of brackets so gcc can find them.
> 
> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> ---
>  tools/include/asm-generic/bitops/__fls.h |   2 +-
>  tools/include/asm-generic/bitops/fls.h   |   2 +-
>  tools/include/asm-generic/bitops/fls64.h |   2 +-
>  tools/include/linux/hashtable.h          | 152 +++++++++++++++++++++++++++++++
>  4 files changed, 155 insertions(+), 3 deletions(-)

So it would be nice to also add a build time warning if the 'upstream' copy of 
hashtable.h deviates from the tooling file.

Just like you are already doing it for other files:

objtool/Makefile:       diff -I'^#include' arch/x86/insn/insn.c ../../arch/x86/lib/insn.c >/dev/null && \

Btw., eventually we might want to factor out such duplication into a single place 
in tools/lib/ or so, to only have a 'master copy' (upstream kernel source), and 
the tooling copy.

Thanks,

	Ingo