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: <20140917113035.GB2129@gondor.apana.org.au>
Date:	Wed, 17 Sep 2014 19:30:35 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Dmitry Kasatkin <d.kasatkin@...sung.com>
Cc:	behanw@...verseincode.com, 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,
	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,
	linux-raid@...r.kernel.org, linux-security-module@...r.kernel.org,
	neilb@...e.de, qat-linux@...el.com, serge@...lyn.com,
	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 Wed, Sep 17, 2014 at 02:15:40PM +0300, Dmitry Kasatkin wrote:
> On 17/09/14 12:22, Herbert Xu wrote:
> > 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,
> 
> Just in case.
> I would still follow advice from "Michał Mirosław" to use shash##__desc[]

Oh yes of course.  My ack is more about the approach.

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
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