linux-kernel - Re: [RFC][PATCH 0/7] locking/rwsem: Convert rwsem count to atomic_long

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Message-ID: <20160603080407.GA12056@gmail.com>
Date:	Fri, 3 Jun 2016 10:04:07 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jason Low <jason.low2@....com>, Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Terry Rudd <terry.rudd@....com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnd Bergmann <arnd@...db.de>,
	Christoph Lameter <cl@...ux.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Waiman Long <Waiman.Long@....com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Peter Hurley <peter@...leysoftware.com>,
	Jason Low <jason.low2@...com>
Subject: Re: [RFC][PATCH 0/7] locking/rwsem: Convert rwsem count to
 atomic_long_t


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

> On Mon, May 16, 2016 at 06:12:25PM -0700, Linus Torvalds wrote:
> > On Mon, May 16, 2016 at 5:37 PM, Jason Low <jason.low2@....com> wrote:
> > >
> > > This rest of the series converts the rwsem count variable to an atomic_long_t
> > > since it is used it as an atomic variable. This allows us to also remove
> > > the rwsem_atomic_{add,update} abstraction and reduce 100+ lines of code.
> > 
> > I would suggest you merge all the "remove rwsem_atomic_{add,update}"
> > patches into a single patch.
> > 
> > I don't see the advantage to splitting those up by architecture, and
> > it does add noise to the series.
> > 
> > Other than that it all looks fine to me.
> 
> OK, done.
> 
> ---
> Subject: locking,rwsem: Remove rwsem_atomic_add() and rwsem_atomic_update()
> From: Jason Low <jason.low2@....com>
> Date: Mon, 16 May 2016 17:38:02 -0700

So I tried to pick up this series, and it broke the Alpha and IA64 builds:

/home/mingo/tip/arch/ia64/include/asm/rwsem.h: In function '___down_write':
/home/mingo/tip/arch/ia64/include/asm/rwsem.h:58:7: error: incompatible types when 
assigning to type 'long int' from type 'atomic_long_t'
   old = sem->count;
       ^

home/mingo/tip/arch/alpha/include/asm/rwsem.h: In function '__down_read':
/home/mingo/tip/arch/alpha/include/asm/rwsem.h:28:11: error: incompatible types 
when assigning to type 'long int' from type 'atomic_long_t'
  oldcount = sem->count;
           ^

etc.

btw., for some reason I don't have the mails from Jason in my mbox, perhaps GMail 
spam filtering ate it?

Thanks,

	Ingo