linux-kernel - Re: [PATCH] padata: Use RCU when fetching pd from do

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Message-ID: <20190717085335.GR17989@gauss3.secunet.de>
Date:   Wed, 17 Jul 2019 10:53:35 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
CC:     Daniel Jordan <daniel.m.jordan@...cle.com>,
        <andrea.parri@...rulasolutions.com>, <boqun.feng@...il.com>,
        <paulmck@...ux.ibm.com>, <peterz@...radead.org>,
        <linux-arch@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] padata: Use RCU when fetching pd from do_serial

On Wed, Jul 17, 2019 at 04:47:40PM +0800, Herbert Xu wrote:
> On Wed, Jul 17, 2019 at 10:28:15AM +0200, Steffen Klassert wrote:
> >
> > I had a patch to support crypto backlog some years ago,
> > but testing with dm-crypt did not show any performance
> > improvement. So I decided to just skip that patch because
> > it added code for no need.
> 
> Well pcrypt is part of the API so it needs to obey the rules.
> So even if it wouldn't make sense to use dm-crypt with pcrypt
> it still needs to do the right thing.

Ok, makes sense. The old patch still exists:

https://git.kernel.org/pub/scm/linux/kernel/git/klassert/linux-stk.git/commit/?h=net-next-pcrypt&id=5909a88ccef6f4c78fe9969160155a8f0ce8fee7

Let me see if I can respin it...