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Date: Thu, 19 May 2016 23:18:24 -0700
From: Davidlohr Bueso <dave@stgolabs.net>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Jason Low <jason.low2@hpe.com>, Ingo Molnar <mingo@redhat.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Richard Henderson <rth@twiddle.net>,
        Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
        Matt Turner <mattst88@gmail.com>, Tony Luck <tony.luck@intel.com>,
        Fenghua Yu <fenghua.yu@intel.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Terry Rudd <terry.rudd@hpe.com>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        Thomas Gleixner <tglx@linutronix.de>, Arnd Bergmann <arnd@arndb.de>,
        Christoph Lameter <cl@linux.com>, Waiman Long <Waiman.Long@hpe.com>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Peter Hurley <peter@hurleysoftware.com>, Jason Low <jason.low2@hp.com>
Subject: Re: [RFC][PATCH 0/7] locking/rwsem: Convert rwsem count to
 atomic_long_t
Message-ID: <20160520061824.GA7086@linux-uzut.site>
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On Tue, 17 May 2016, Peter Zijlstra wrote:

>Subject: locking,rwsem: Remove rwsem_atomic_add() and rwsem_atomic_update()
>From: Jason Low <jason.low2@hpe.com>
>Date: Mon, 16 May 2016 17:38:02 -0700
>
>The rwsem-xadd count has been converted to an atomic variable and the
>rwsem code now directly uses atomic_long_add() and
>atomic_long_add_return(), so we can remove the arch implementations of
>rwsem_atomic_add() and rwsem_atomic_update().
>
>Cc: Waiman Long <Waiman.Long@hpe.com>
>Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
>Cc: Jason Low <jason.low2@hp.com>
>Cc: Richard Henderson <rth@twiddle.net>
>Cc: Ingo Molnar <mingo@redhat.com>
>Cc: Fenghua Yu <fenghua.yu@intel.com>
>Cc: Andrew Morton <akpm@linux-foundation.org>
>Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
>Cc: Linus Torvalds <torvalds@linux-foundation.org>
>Cc: Tim Chen <tim.c.chen@linux.intel.com>
>Cc: Christoph Lameter <cl@linux.com>
>Cc: Thomas Gleixner <tglx@linutronix.de>
>Cc: Arnd Bergmann <arnd@arndb.de>
>Cc: Terry Rudd <terry.rudd@hpe.com>
>Cc: Peter Hurley <peter@hurleysoftware.com>
>Cc: Davidlohr Bueso <dave@stgolabs.net>

Acked-by: Davidlohr Bueso <dave@stgolabs.net>

>Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
>Cc: Tony Luck <tony.luck@intel.com>
>Cc: Matt Turner <mattst88@gmail.com>
>Signed-off-by: Jason Low <jason.low2@hpe.com>
>Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
>---
> arch/alpha/include/asm/rwsem.h |   42 -----------------------------------------
> arch/ia64/include/asm/rwsem.h  |    7 ------
> arch/s390/include/asm/rwsem.h  |   37 ------------------------------------
> arch/x86/include/asm/rwsem.h   |   18 -----------------
> include/asm-generic/rwsem.h    |   16 ---------------
> 5 files changed, 120 deletions(-)

Nice. This, along with Michal's work getting rid of a lot of superfluous
implementations, have gotten rid of plenty of rwsem code in arch/*

Thanks,
Davidlohr