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From: Will Deacon <will.deacon@arm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: torvalds@linux-foundation.org, mingo@kernel.org,
	tglx@linutronix.de, paulmck@linux.vnet.ibm.com,
	boqun.feng@gmail.com, waiman.long@hpe.com, fweisbec@gmail.com,
	linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	rth@twiddle.net, vgupta@synopsys.com, linux@arm.linux.org.uk,
	egtvedt@samfundet.no, realmz6@gmail.com,
	ysato@users.sourceforge.jp, rkuo@codeaurora.org,
	tony.luck@intel.com, geert@linux-m68k.org,
	james.hogan@imgtec.com, ralf@linux-mips.org, dhowells@redhat.com,
	jejb@parisc-linux.org, mpe@ellerman.id.au,
	schwidefsky@de.ibm.com, dalias@libc.org, davem@davemloft.net,
	cmetcalf@mellanox.com, jcmvbkbc@gmail.com, arnd@arndb.de,
	dbueso@suse.de, fengguang.wu@intel.com
Subject: Re: [RFC][PATCH 05/31] locking,arm64: Implement atomic{,64}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}()
Date: Fri, 22 Apr 2016 12:08:33 +0100	[thread overview]
Message-ID: <20160422110832.GB10289@arm.com> (raw)
In-Reply-To: <20160422093923.366551860@infradead.org>

On Fri, Apr 22, 2016 at 11:04:18AM +0200, Peter Zijlstra wrote:
> Implement FETCH-OP atomic primitives, these are very similar to the
> existing OP-RETURN primitives we already have, except they return the
> value of the atomic variable _before_ modification.
> 
> This is especially useful for irreversible operations -- such as
> bitops (because it becomes impossible to reconstruct the state prior
> to modification).
> 
> XXX lacking LSE bits

I'll cook a patch for this, but thanks for the series.

Will

  reply	other threads:[~2016-04-22 11:08 UTC|newest]

Thread overview: 79+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-22  9:04 [RFC][PATCH 00/31] implement atomic_fetch_$op Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 01/31] locking: Flip arguments to atomic_fetch_or Peter Zijlstra
2016-04-22 10:54   ` Will Deacon
2016-04-22 11:09   ` Geert Uytterhoeven
2016-04-22 11:09     ` Geert Uytterhoeven
2016-04-22 14:18     ` Peter Zijlstra
2016-04-22 14:18       ` Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 02/31] locking,alpha: Implement atomic{,64}_fetch_{add,sub,and,andnot,or,xor}() Peter Zijlstra
2016-04-22 16:57   ` Richard Henderson
2016-04-23  1:55     ` Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 03/31] locking,arc: Implement atomic_fetch_{add,sub,and,andnot,or,xor}() Peter Zijlstra
2016-04-22 10:50   ` Vineet Gupta
2016-04-22 10:50     ` Vineet Gupta
2016-04-22 14:16     ` Peter Zijlstra
2016-04-22 14:16       ` Peter Zijlstra
2016-04-25  4:26       ` Vineet Gupta
2016-04-25  4:26         ` Vineet Gupta
2016-04-22 14:26     ` Peter Zijlstra
2016-04-22 14:26       ` Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 04/31] locking,arm: Implement atomic{,64}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}() Peter Zijlstra
2016-04-22 11:35   ` Will Deacon
2016-04-22  9:04 ` [RFC][PATCH 05/31] locking,arm64: " Peter Zijlstra
2016-04-22 11:08   ` Will Deacon [this message]
2016-04-22 14:23   ` Will Deacon
2016-04-22 14:23     ` Will Deacon
2016-04-22 14:23     ` Will Deacon
2016-04-22  9:04 ` [RFC][PATCH 06/31] locking,avr32: Implement atomic_fetch_{add,sub,and,or,xor}() Peter Zijlstra
2016-04-22 11:58   ` Hans-Christian Noren Egtvedt
2016-04-22  9:04 ` [RFC][PATCH 07/31] locking,blackfin: " Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 08/31] locking,frv: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 09/31] locking,h8300: Implement atomic_fetch_{add,sub,and,or,xor}() Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 10/31] locking,hexagon: " Peter Zijlstra
2016-04-23  2:16   ` Peter Zijlstra
2016-04-26  0:39     ` Richard Kuo
2016-04-22  9:04 ` [RFC][PATCH 11/31] locking,ia64: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 12/31] locking,m32r: Implement atomic_fetch_{add,sub,and,or,xor}() Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 13/31] locking,m68k: " Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 14/31] locking,metag: " Peter Zijlstra
2016-04-30  0:20   ` James Hogan
2016-04-30  0:20     ` James Hogan
2016-05-02  8:15     ` Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 15/31] locking,mips: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 16/31] locking,mn10300: Implement atomic_fetch_{add,sub,and,or,xor}() Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 17/31] locking,parisc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 18/31] locking,powerpc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}{,_relaxed,_acquire,_release}() Peter Zijlstra
2016-04-22 16:41   ` Boqun Feng
2016-04-23  2:31     ` Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 19/31] locking,s390: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() Peter Zijlstra
2016-04-25  8:06   ` Martin Schwidefsky
2016-04-25  8:26     ` Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 20/31] locking,sh: Implement atomic_fetch_{add,sub,and,or,xor}() Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 21/31] locking,sparc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 22/31] locking,tile: " Peter Zijlstra
2016-04-25 21:10   ` Chris Metcalf
2016-04-25 21:10     ` Chris Metcalf
2016-04-26 14:00     ` [PATCH] tile: clarify barrier semantics of atomic_add_return Chris Metcalf
     [not found]   ` <571E840A.8090703@mellanox.com>
2016-04-26 15:28     ` [RFC][PATCH 22/31] locking,tile: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() Peter Zijlstra
2016-04-26 15:32       ` Chris Metcalf
2016-04-26 15:32         ` Chris Metcalf
2016-04-22  9:04 ` [RFC][PATCH 23/31] locking,x86: " Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 24/31] locking,xtensa: Implement atomic_fetch_{add,sub,and,or,xor}() Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 25/31] locking: Fix atomic64_relaxed bits Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 26/31] locking: Implement atomic{,64,_long}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}() Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 27/31] locking: Remove linux/atomic.h:atomic_fetch_or Peter Zijlstra
2016-04-22 13:02   ` Will Deacon
2016-04-22 14:21     ` Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 28/31] locking: Remove the deprecated atomic_{set,clear}_mask() functions Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 29/31] locking,alpha: Convert to _relaxed atomics Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 30/31] locking,mips: " Peter Zijlstra
2016-04-22  9:04 ` [RFC][PATCH 31/31] locking,qrwlock: Employ atomic_fetch_add_acquire() Peter Zijlstra
2016-04-22 14:25   ` Waiman Long
2016-04-22 14:25     ` Waiman Long
2016-04-22  9:44 ` [RFC][PATCH 00/31] implement atomic_fetch_$op Peter Zijlstra
2016-04-22 12:56   ` Fengguang Wu
2016-04-22 13:03     ` Will Deacon
2016-04-22 14:23     ` Peter Zijlstra
2016-04-23  1:59       ` Fengguang Wu
2016-04-22 18:35     ` Kalle Valo
2016-04-23  3:23       ` Fengguang Wu

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