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

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Date:   Wed,  2 May 2018 11:57:16 +0200
From:   Antoine Tenart <antoine.tenart@...tlin.com>
To:     herbert@...dor.apana.org.au, davem@...emloft.net
Cc:     Antoine Tenart <antoine.tenart@...tlin.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        thomas.petazzoni@...tlin.com, maxime.chevallier@...tlin.com,
        gregory.clement@...tlin.com, miquel.raynal@...tlin.com,
        nadavh@...vell.com, oferh@...vell.com, igall@...vell.com
Subject: [PATCH 01/10] crypto: aead - allow to allocate AEAD requests on the stack

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
+
 struct crypto_aead {
 	unsigned int authsize;
 	unsigned int reqsize;
-- 
2.17.0