linux-kernel - Re: [RFC][PATCH 7/7] kref: Implement using refcount

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Message-ID: <20161115084009.GB15734@gmail.com>
Date:   Tue, 15 Nov 2016 09:40:09 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     gregkh@...uxfoundation.org, keescook@...omium.org,
        will.deacon@....com, elena.reshetova@...el.com, arnd@...db.de,
        tglx@...utronix.de, hpa@...or.com, dave@...gbits.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 7/7] kref: Implement using refcount_t


* Peter Zijlstra <peterz@...radead.org> wrote:

> Provide refcount_t, an atomic_t like primitive built just for
> refcounting.
> 
> It provides overflow and underflow checks as well as saturation
> semantics such that when it overflows, we'll never attempt to free it
> again, ever.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  include/linux/kref.h     |   29 ++----
>  include/linux/refcount.h |  221 +++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 232 insertions(+), 18 deletions(-)

I'd suggest splitting this patch into two parts: first patch introduces the 
refcount.h facility, second patch changes over struct kref to the new facility.

Thanks,

	Ingo