From: Steffen Klassert <steffen.klassert@secunet.com>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>,
andrea.parri@amarulasolutions.com, boqun.feng@gmail.com,
paulmck@linux.ibm.com, peterz@infradead.org,
linux-arch@vger.kernel.org, linux-crypto@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] padata: use smp_mb in padata_reorder to avoid orphaned padata jobs
Date: Fri, 12 Jul 2019 12:10:12 +0200 [thread overview]
Message-ID: <20190712101012.GW14601@gauss3.secunet.de> (raw)
In-Reply-To: <20190712100636.mqdr567p7ozanlyl@gondor.apana.org.au>
On Fri, Jul 12, 2019 at 06:06:36PM +0800, Herbert Xu wrote:
> Daniel Jordan <daniel.m.jordan@oracle.com> wrote:
> >
> > CPU0 CPU1
> >
> > padata_reorder padata_do_serial
> > LOAD reorder_objects // 0
> > INC reorder_objects // 1
> > padata_reorder
> > TRYLOCK pd->lock // failed
> > UNLOCK pd->lock
>
> I think this can't happen because CPU1 won't call padata_reorder
> at all as it's the wrong CPU so it gets pushed back onto a work
> queue which will go back to CPU0.
>
> Steffen, could you please take a look at this as there clearly
> is a problem here?
I'm currently travelling, will have a look at it when I'm back.
next prev parent reply other threads:[~2019-07-12 10:10 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-11 22:12 [PATCH] padata: use smp_mb in padata_reorder to avoid orphaned padata jobs Daniel Jordan
2019-07-11 22:12 ` Daniel Jordan
2019-07-12 10:06 ` Herbert Xu
2019-07-12 10:06 ` Herbert Xu
2019-07-12 10:10 ` Steffen Klassert [this message]
2019-07-12 10:10 ` Steffen Klassert
2019-07-12 16:07 ` Daniel Jordan
2019-07-12 16:07 ` Daniel Jordan
2019-07-13 5:03 ` Herbert Xu
2019-07-13 5:03 ` Herbert Xu
2019-07-15 16:10 ` Daniel Jordan
2019-07-15 16:10 ` Daniel Jordan
2019-07-16 10:04 ` Herbert Xu
2019-07-16 10:04 ` Herbert Xu
2019-07-16 11:14 ` Steffen Klassert
2019-07-16 11:14 ` Steffen Klassert
2019-07-16 12:57 ` [PATCH] padata: Use RCU when fetching pd from do_serial Herbert Xu
2019-07-16 12:57 ` Herbert Xu
2019-07-16 13:09 ` Herbert Xu
2019-07-16 13:09 ` Herbert Xu
2019-07-16 13:23 ` [v2 PATCH] " Herbert Xu
2019-07-16 13:23 ` Herbert Xu
2019-07-17 8:36 ` Steffen Klassert
2019-07-17 8:36 ` Steffen Klassert
2019-07-17 8:50 ` Herbert Xu
2019-07-17 8:50 ` Herbert Xu
2019-07-17 8:28 ` [PATCH] " Steffen Klassert
2019-07-17 8:28 ` Steffen Klassert
2019-07-17 8:47 ` Herbert Xu
2019-07-17 8:47 ` Herbert Xu
2019-07-17 8:53 ` Steffen Klassert
2019-07-17 8:53 ` Steffen Klassert
2019-07-16 13:15 ` Peter Zijlstra
2019-07-16 13:15 ` Peter Zijlstra
2019-07-16 13:18 ` Herbert Xu
2019-07-16 13:18 ` Herbert Xu
2019-07-16 13:50 ` Peter Zijlstra
2019-07-16 13:50 ` Peter Zijlstra
2019-07-16 13:52 ` Herbert Xu
2019-07-16 13:52 ` Herbert Xu
2019-07-16 12:53 ` [PATCH] padata: use smp_mb in padata_reorder to avoid orphaned padata jobs Andrea Parri
2019-07-16 12:53 ` Andrea Parri
2019-07-16 13:13 ` Peter Zijlstra
2019-07-16 13:13 ` Peter Zijlstra
2019-07-16 15:01 ` Herbert Xu
2019-07-16 15:01 ` Herbert Xu
2019-07-16 15:44 ` Daniel Jordan
2019-07-16 15:44 ` Daniel Jordan
2019-07-16 16:32 ` [PATCH v2] " Daniel Jordan
2019-07-16 16:32 ` Daniel Jordan
2019-07-17 11:11 ` [PATCH] padata: Replace delayed timer with immediate workqueue in padata_reorder Herbert Xu
2019-07-17 11:11 ` Herbert Xu
2019-07-17 18:32 ` Daniel Jordan
2019-07-17 18:32 ` Daniel Jordan
2019-07-18 3:31 ` Herbert Xu
2019-07-18 3:31 ` Herbert Xu
2019-07-18 14:27 ` Daniel Jordan
2019-07-18 14:27 ` Daniel Jordan
2019-07-18 14:56 ` Herbert Xu
2019-07-18 14:56 ` Herbert Xu
2019-07-18 15:01 ` [v2 PATCH] " Herbert Xu
2019-07-18 15:01 ` Herbert Xu
2019-07-19 14:37 ` Daniel Jordan
2019-07-19 14:37 ` Daniel Jordan
2019-07-19 14:55 ` Herbert Xu
2019-07-19 14:55 ` Herbert Xu
2019-07-19 14:27 ` [PATCH] " Daniel Jordan
2019-07-19 14:27 ` Daniel Jordan
2019-07-17 23:21 ` Daniel Jordan
2019-07-17 23:21 ` Daniel Jordan
2019-07-18 3:30 ` Herbert Xu
2019-07-18 3:30 ` Herbert Xu
2019-07-18 14:25 ` Daniel Jordan
2019-07-18 14:25 ` Daniel Jordan
2019-07-18 14:49 ` Herbert Xu
2019-07-18 14:49 ` Herbert Xu
2019-07-19 14:21 ` Daniel Jordan
2019-07-19 14:21 ` Daniel Jordan
2019-07-18 5:42 ` [PATCH v2] padata: use smp_mb in padata_reorder to avoid orphaned padata jobs Herbert Xu
2019-07-18 5:42 ` Herbert Xu
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