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List:       linux-backports
Subject:    [PATCH 08/16] header: add SHASH_DESC_ON_STACK()
From:       Hauke Mehrtens <hauke () hauke-m ! de>
Date:       2016-04-30 21:00:40
Message-ID: 1462050048-8953-9-git-send-email-hauke () hauke-m ! de
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SHASH_DESC_ON_STACK was added in Linux commit a0a77af14 "crypto:
LLVMLinux: Add macro to remove use of VLAIS in crypto code".

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 backport/backport-include/crypto/hash.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/backport/backport-include/crypto/hash.h b/backport/backport-include/crypto/hash.h
index 3510659..9c26e0c 100644
--- a/backport/backport-include/crypto/hash.h
+++ b/backport/backport-include/crypto/hash.h
@@ -28,4 +28,11 @@ static inline void ahash_request_zero(struct ahash_request *req)
 	struct ahash_request *name = (void *)__##name##_desc
 #endif
 
+#ifndef SHASH_DESC_ON_STACK
+#define SHASH_DESC_ON_STACK(shash, ctx)				  \
+	char __##shash##_desc[sizeof(struct shash_desc) +	  \
+		crypto_shash_descsize(ctx)] CRYPTO_MINALIGN_ATTR; \
+	struct shash_desc *shash = (struct shash_desc *)__##shash##_desc
+#endif
+
 #endif /* _BACKPORT_CRYPTO_HASH_H */
-- 
2.8.1

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