mirror of
https://github.com/torvalds/linux
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0458a953d8
Replaced the use of a Variable Length Array In Struct (VLAIS) with a C99 compliant equivalent. This patch instead allocates the appropriate amount of memory using a char array using the SHASH_DESC_ON_STACK macro. The new code can be compiled with both gcc and clang. Signed-off-by: Vinícius Tinti <viniciustinti@gmail.com> Reviewed-by: Jan-Simon Möller <dl9pf@gmx.de> Reviewed-by: Mark Charlebois <charlebm@gmail.com> Signed-off-by: Behan Webster <behanw@converseincode.com> Acked-by: Chris Mason <clm@fb.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Cc: "David S. Miller" <davem@davemloft.net>
46 lines
1 KiB
C
46 lines
1 KiB
C
/*
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* Copyright (C) 2014 Filipe David Borba Manana <fdmanana@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <crypto/hash.h>
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#include <linux/err.h>
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#include "hash.h"
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static struct crypto_shash *tfm;
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int __init btrfs_hash_init(void)
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{
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tfm = crypto_alloc_shash("crc32c", 0, 0);
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return PTR_ERR_OR_ZERO(tfm);
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}
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void btrfs_hash_exit(void)
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{
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crypto_free_shash(tfm);
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}
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u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length)
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{
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SHASH_DESC_ON_STACK(shash, tfm);
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u32 *ctx = (u32 *)shash_desc_ctx(shash);
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int err;
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shash->tfm = tfm;
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shash->flags = 0;
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*ctx = crc;
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err = crypto_shash_update(shash, address, length);
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BUG_ON(err);
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return *ctx;
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}
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