From: Peter Zijlstra <peterz@infradead.org>
To: Will Deacon <will.deacon@arm.com>
Cc: linux-arch@vger.kernel.org, Waiman.Long@hp.com,
linux-kernel@vger.kernel.org, paulmck@linux.vnet.ibm.com
Subject: Re: [PATCH v3 1/8] atomics: add acquire/release/relaxed variants of some atomic operations
Date: Mon, 27 Jul 2015 11:14:30 +0200 [thread overview]
Message-ID: <20150727091430.GP19282@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1437746681-2809-2-git-send-email-will.deacon@arm.com>
On Fri, Jul 24, 2015 at 03:04:34PM +0100, Will Deacon wrote:
> This patch introduces three new ordering semantics for these operations:
>
> - *_relaxed: No ordering guarantees. This is similar to what we have
> already for the non-return atomics (e.g. atomic_add).
>
> - *_acquire: ACQUIRE semantics, similar to smp_load_acquire.
>
> - *_release: RELEASE semantics, similar to smp_store_release.
Do we want to further specify that for the RmW operations the Read/load
will provide the acquire and the Write/store the release?
next prev parent reply other threads:[~2015-07-27 9:14 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-24 14:04 [PATCH v3 0/8] Add generic support for relaxed atomics Will Deacon
2015-07-24 14:04 ` [PATCH v3 1/8] atomics: add acquire/release/relaxed variants of some atomic operations Will Deacon
2015-07-27 9:14 ` Peter Zijlstra [this message]
2015-07-27 10:21 ` Will Deacon
2015-07-27 16:33 ` Will Deacon
2015-07-27 17:51 ` Peter Zijlstra
2015-07-24 14:04 ` [PATCH v3 2/8] asm-generic: rework atomic-long.h to avoid bulk code duplication Will Deacon
2015-07-24 14:04 ` [PATCH v3 3/8] asm-generic: add relaxed/acquire/release variants for atomic_long_t Will Deacon
2015-07-24 14:04 ` [PATCH v3 4/8] lockref: remove homebrew cmpxchg64_relaxed macro definition Will Deacon
2015-07-24 14:04 ` [PATCH v3 5/8] locking/qrwlock: implement queue_write_unlock using smp_store_release Will Deacon
2015-07-24 14:04 ` [PATCH v3 6/8] locking/qrwlock: make use of acquire/release/relaxed atomics Will Deacon
2015-07-24 14:04 ` [PATCH v3 7/8] include/llist: use linux/atomic.h instead of asm/cmpxchg.h Will Deacon
2015-07-24 14:04 ` [PATCH v3 8/8] ARM: atomics: define our SMP atomics in terms of _relaxed operations Will Deacon
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