linux-kernel - RE: [PATCH 1/9] tools: convert cgroup_sel.refcnt from atomic_t to refcount

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Message-ID: <2236FBA76BA1254E88B949DDB74E612B41C4EC7E@IRSMSX102.ger.corp.intel.com>
Date:   Wed, 22 Feb 2017 14:29:18 +0000
From:   "Reshetova, Elena" <elena.reshetova@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "alexander.shishkin@...ux.intel.com" 
        <alexander.shishkin@...ux.intel.com>,
        "jolsa@...nel.org" <jolsa@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "matija.glavinic-pecotic.ext@...ia.com" 
        <matija.glavinic-pecotic.ext@...ia.com>,
        Hans Liljestrand <ishkamiel@...il.com>,
        Kees Cook <keescook@...omium.org>,
        David Windsor <dwindsor@...il.com>
Subject: RE: [PATCH 1/9] tools: convert cgroup_sel.refcnt from atomic_t to
 refcount_t

> Em Tue, Feb 21, 2017 at 05:34:55PM +0200, Elena Reshetova escreveu:
> > refcount_t type and corresponding API should be
> > used instead of atomic_t when the variable is used as
> > a reference counter. This allows to avoid accidental
> > refcounter overflows that might lead to use-after-free
> > situations.
> >  #define __CGROUP_H__
> >
> > -#include <linux/atomic.h>
> > +#include <linux/refcount.h>
> 
> So this is the first one, I was expecting the copy from
> include/linux/refcount.h to be made to tools/include/linux/refcount.h,
> as was done for tools/include/linux/atomic.h and all the other stuff in
> tools/include/
> 
> See:
> 
> commit c4b6014e8bb0c8d47fe5c71ebc604f31091e5d3f
> Author: Arnaldo Carvalho de Melo <acme@...hat.com>
> Date:   Mon Jul 11 10:28:48 2016 -0300
> 
>     tools: Add copy of perf_event.h to tools/include/linux/
> 
> --------------
> 
> For one of the reasons we've been doing this.

Hm.. I have taken a look on it and I am confused.
refcount.h is not exactly standalone header and seems to bring in quite some many dependencies to other headers (linux/bug.h, linux/mutex.h etc.), which are not present in tools headers dirs.
I tried to compile perf tool as a start, copied the refcount.h to tools/include/linux/ and somewhere after it wanted me to bring the 10th header I stopped, because this cannot be right, or?

Best Regards,
Elena.