linux-kernel - Re: [PATCH v3 01/12] crypto: LLVMLinux: Add macro to remove use of VLAIS in crypto code

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Message-ID: <20140917092212.GA1213@gondor.apana.org.au>
Date:	Wed, 17 Sep 2014 17:22:12 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	behanw@...verseincode.com
Cc:	agk@...hat.com, clm@...com, davem@...emloft.net,
	dm-devel@...hat.com, fabf@...net.be, jbacik@...com,
	snitzer@...hat.com, tadeusz.struk@...el.com,
	akpm@...ux-foundation.org, bruce.w.allan@...el.com,
	d.kasatkin@...sung.com, james.l.morris@...cle.com,
	john.griffin@...el.com, linux-btrfs@...r.kernel.org,
	linux-crypto@...r.kernel.org,
	linux-ima-devel@...ts.sourceforge.net,
	linux-ima-user@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
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	thomas.lendacky@....com, zohar@...ux.vnet.ibm.com,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH v3 01/12] crypto: LLVMLinux: Add macro to remove use of
 VLAIS in crypto code

On Mon, Sep 15, 2014 at 12:30:23AM -0700, behanw@...verseincode.com wrote:
> From: Behan Webster <behanw@...verseincode.com>
> 
> Add a macro which replaces the use of a Variable Length Array In Struct (VLAIS)
> with a C99 compliant equivalent. This macro instead allocates the appropriate
> amount of memory using an char array.
> 
> The new code can be compiled with both gcc and clang.
> 
> struct shash_desc contains a flexible array member member ctx declared with
> CRYPTO_MINALIGN_ATTR, so sizeof(struct shash_desc) aligns the beginning
> of the array declared after struct shash_desc with long long.
> 
> No trailing padding is required because it is not a struct type that can
> be used in an array.
> 
> The CRYPTO_MINALIGN_ATTR is required so that desc is aligned with long long
> as would be the case for a struct containing a member with
> CRYPTO_MINALIGN_ATTR.
> 
> Signed-off-by: Behan Webster <behanw@...verseincode.com>

Acked-by: Herbert Xu <herbert@...dor.apana.org.au>

Thanks,
-- 
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
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