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Message-ID: <20230406085629.3e0c9514@kernel.org> Date: Thu, 6 Apr 2023 08:56:29 -0700 From: Jakub Kicinski <kuba@...nel.org> To: "Paul E. McKenney" <paulmck@...nel.org> Cc: Herbert Xu <herbert@...dor.apana.org.au>, Alexander Duyck <alexander.duyck@...il.com>, Heiner Kallweit <hkallweit1@...il.com>, davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com Subject: Re: [PATCH net-next 1/3] net: provide macros for commonly copied lockless queue stop/wake code On Thu, 6 Apr 2023 08:45:10 -0700 Paul E. McKenney wrote: > > Starting the queue only happens from softirq (I hope) and stopping > > can happen from any context. So we're risking false-starts again. > > I think this puts to bed any hope of making this code safe against > > false-starts with just barriers :( > > Is it possible to jam all the relevant state into a single variable? > (I believe that that answer is "no", but just in case asking this question > inspires someone to come up with a good idea.) Not in any obvious way, half of the state is driver-specific the other half is flags maintained by the core :S
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