linux-kernel - RE: [PATCH 01/10] crypto: aead - allow to allocate AEAD requests on the stack

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Date:   Wed, 2 May 2018 14:55:19 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Antoine Tenart' <antoine.tenart@...tlin.com>,
        "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        "davem@...emloft.net" <davem@...emloft.net>
CC:     "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
        "maxime.chevallier@...tlin.com" <maxime.chevallier@...tlin.com>,
        "gregory.clement@...tlin.com" <gregory.clement@...tlin.com>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "nadavh@...vell.com" <nadavh@...vell.com>,
        "oferh@...vell.com" <oferh@...vell.com>,
        "igall@...vell.com" <igall@...vell.com>
Subject: RE: [PATCH 01/10] crypto: aead - allow to allocate AEAD requests on
 the stack

From: Antoine Tenart
> Sent: 02 May 2018 10:57
> Adds the AEAD_REQUEST_ON_STACK primitive to allow allocating AEAD
> requests on the stack, as it can already be done with various other
> crypto algorithms within the kernel.
> 
> Signed-off-by: Antoine Tenart <antoine.tenart@...tlin.com>
> ---
>  include/crypto/aead.h | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/include/crypto/aead.h b/include/crypto/aead.h
> index 1e26f790b03f..b67064786546 100644
> --- a/include/crypto/aead.h
> +++ b/include/crypto/aead.h
> @@ -151,6 +151,11 @@ struct aead_alg {
>  	struct crypto_alg base;
>  };
> 
> +#define AEAD_REQUEST_ON_STACK(name, tfm) \
> +	char __##name##_desc[sizeof(struct aead_request) + \
> +		crypto_aead_reqsize(tfm)] CRYPTO_MINALIGN_ATTR; \
> +	struct aead_request *name = (void *)__##name##_desc
> +

This looks stunningly like a VLA.

	David