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From: Thomas Monjalon <thomas@monjalon.net>
To: Phil Yang <Phil.Yang@arm.com>,
	Diogo Behrens <diogo.behrens@huawei.com>,
	Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
Cc: dev@dpdk.org, nd <nd@arm.com>
Subject: Re: [dpdk-dev] [PATCH] librte_eal: fix mcslock hang on weak memory
Date: Tue, 06 Oct 2020 23:49:45 +0200
Message-ID: <1947647.zX4bR4m4Ni@thomas> (raw)
In-Reply-To: <DBAPR08MB58148C46395B8592D9AC2B8F98510@DBAPR08MB5814.eurprd08.prod.outlook.com>

31/08/2020 20:45, Honnappa Nagarahalli:
> 
> Hi Diogo,
> 
> Thanks for your explanation.
> 
> As documented in https://developer.arm.com/documentation/ddi0487/fc  B2.9.5 Load-Exclusive and Store-Exclusive instruction usage restrictions:
> " Between the Load-Exclusive and the Store-Exclusive, there are no explicit memory accesses, preloads, 
> direct or indirect System register writes, address translation instructions, cache or TLB maintenance
> instructions, exception generating instructions, exception returns, or indirect branches."
> [Honnappa] This is a requirement on the software, not on the micro-architecture.
> We are having few discussions internally, will get back soon.
> 
> So it is not allowed to insert (1) & (4) between (2, 3). The cmpxchg operation is atomic.


Please what is the conclusion?




  reply	other threads:[~2020-10-06 21:49 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-26  9:20 Diogo Behrens
2020-08-26 10:17 ` Phil Yang
2020-08-27  8:56   ` Diogo Behrens
2020-08-28  9:19     ` Phil Yang
2020-08-31 18:45       ` Honnappa Nagarahalli
2020-10-06 21:49         ` Thomas Monjalon [this message]
2020-10-07  9:55           ` Diogo Behrens
2020-10-20 11:56             ` Thomas Monjalon
2020-10-20 21:49               ` Honnappa Nagarahalli
2020-11-22 18:07                 ` Thomas Monjalon
2020-11-23 15:06                   ` Honnappa Nagarahalli
2020-11-23 15:44                     ` Stephen Hemminger
2020-11-23 18:16                       ` Honnappa Nagarahalli
2020-11-23 18:29 ` Honnappa Nagarahalli
2020-11-23 19:36   ` Stephen Hemminger
2020-11-25  4:50     ` Honnappa Nagarahalli
2020-11-25  8:41       ` Diogo Behrens
2020-11-25 14:16   ` Thomas Monjalon

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