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btrfs: LLVMLinux: Remove VLAIS 

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>
This commit is contained in:
Vinícius Tinti 2014-04-04 18:21:24 -03:00 committed by Behan Webster
parent a0a77af141
commit 0458a953d8
1 changed files with 7 additions and 9 deletions
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16
fs/btrfs/hash.c
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@ -31,18 +31,16 @@ void btrfs_hash_exit(void)
u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length)
{
struct {
struct shash_desc shash;
char ctx[crypto_shash_descsize(tfm)];
} desc;
SHASH_DESC_ON_STACK(shash, tfm);
u32 *ctx = (u32 *)shash_desc_ctx(shash);
int err;
desc.shash.tfm = tfm;
desc.shash.flags = 0;
*(u32 *)desc.ctx = crc;
shash->tfm = tfm;
shash->flags = 0;
*ctx = crc;
err = crypto_shash_update(&desc.shash, address, length);
err = crypto_shash_update(shash, address, length);
BUG_ON(err);
return *(u32 *)desc.ctx;
return *ctx;
}