From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f170.google.com ([209.85.192.170]:51892 "EHLO mail-pd0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755434AbaIBWdT (ORCPT ); Tue, 2 Sep 2014 18:33:19 -0400 Received: by mail-pd0-f170.google.com with SMTP id r10so9661896pdi.29 for ; Tue, 02 Sep 2014 15:33:19 -0700 (PDT) From: behanw@converseincode.com To: agk@redhat.com, clm@fb.com, davem@davemloft.net, dm-devel@redhat.com, fabf@skynet.be, herbert@gondor.apana.org.au, jbacik@fb.com, snitzer@redhat.com Cc: akpm@linux-foundation.org, james.l.morris@oracle.com, john.johansen@canonical.com, linux-btrfs@vger.kernel.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, linux-security-module@vger.kernel.org, neilb@suse.de, serge@hallyn.com, torvalds@linux-foundation.org, =?UTF-8?q?Jan-Simon=20M=C3=B6ller?= , Behan Webster , pageexec@freemail.hu Subject: [PATCH RFC 4/6] crypto: LLVMLinux: Remove VLAIS usage from crypto/testmgr.c Date: Tue, 2 Sep 2014 15:32:31 -0700 Message-Id: <1409697153-7006-5-git-send-email-behanw@converseincode.com> In-Reply-To: <1409697153-7006-1-git-send-email-behanw@converseincode.com> References: <1409697153-7006-1-git-send-email-behanw@converseincode.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: From: Jan-Simon Möller The use of variable length arrays in structs (VLAIS) in the Linux Kernel code precludes the use of compilers which don't implement VLAIS (for instance the Clang compiler). This patch instead allocates the appropriate amount of memory using an char array. 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: Jan-Simon Möller Signed-off-by: Behan Webster Cc: pageexec@freemail.hu --- crypto/testmgr.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/crypto/testmgr.c b/crypto/testmgr.c index ac2b631..f4bf5c2 100644 --- a/crypto/testmgr.c +++ b/crypto/testmgr.c @@ -1714,16 +1714,16 @@ static int alg_test_crc32c(const struct alg_test_desc *desc, } do { - struct { - struct shash_desc shash; - char ctx[crypto_shash_descsize(tfm)]; - } sdesc; + char sdesc[sizeof(struct shash_desc) + + crypto_shash_descsize(tfm)] CRYPTO_MINALIGN_ATTR; + struct shash_desc *shash = (struct shash_desc *)sdesc; + u32 *ctx = (u32 *)shash_desc_ctx(shash); - sdesc.shash.tfm = tfm; - sdesc.shash.flags = 0; + shash->tfm = tfm; + shash->flags = 0; - *(u32 *)sdesc.ctx = le32_to_cpu(420553207); - err = crypto_shash_final(&sdesc.shash, (u8 *)&val); + *ctx = le32_to_cpu(420553207); + err = crypto_shash_final(shash, (u8 *)&val); if (err) { printk(KERN_ERR "alg: crc32c: Operation failed for " "%s: %d\n", driver, err); -- 1.9.1