linux-kernel - Re: [PATCH] crypto: lib/chacha20poly1305 - Set SG_MITER

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Message-ID: <20200915101043.GA27327@gondor.apana.org.au>
Date:   Tue, 15 Sep 2020 20:10:43 +1000
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH] crypto: lib/chacha20poly1305 - Set SG_MITER_ATOMIC
 unconditionally

On Tue, Sep 15, 2020 at 01:08:31PM +0300, Ard Biesheuvel wrote:
>
> But making atomic kmap preemptible/sleepable creates the exact same
> problem, i.e., that we have no idea which existing callers are
> currently relying on those preemption disabling semantics, so we can't
> just take them away. Or am I missing something?

Good point.

Thomas mentioned that RT has been doing this for a while now so
perhaps someone has studied this problem already? Thomas?

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt