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

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Message-ID: <20190717082815.GP17989@gauss3.secunet.de>
Date:   Wed, 17 Jul 2019 10:28:15 +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 Tue, Jul 16, 2019 at 09:09:28PM +0800, Herbert Xu wrote:
> 
> However, I think this leads to another bug in that pcrypt doesn't
> support dm-crypt properly.  It never does the backlog stuff and
> therefore can't guarantee reliable processing which dm-crypt requires.
> 
> Is it intentional to only allow pcrypt for IPsec?

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.