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tcp: suppress a division by zero warning

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Andrew Morton reported following warning on one ARM build
with gcc-4.4 :

net/ipv4/inet_hashtables.c: In function 'inet_ehash_locks_alloc':
net/ipv4/inet_hashtables.c:617: warning: division by zero

Even guarded with a test on sizeof(spinlock_t), compiler does not
like current construct on a !CONFIG_SMP build.

Remove the warning by using a temporary variable.

Fixes: 095dc8e0c3 ("tcp: fix/cleanup inet_ehash_locks_alloc()")
Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-07-22 07:02:00 +02:00 committed by David S. Miller
parent 0bccece592
commit 89e478a2aa
1 changed files with 5 additions and 6 deletions
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11
net/ipv4/inet_hashtables.c
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@ -624,22 +624,21 @@ EXPORT_SYMBOL_GPL(inet_hashinfo_init);
int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
{
unsigned int locksz = sizeof(spinlock_t);
unsigned int i, nblocks = 1;
if (sizeof(spinlock_t) != 0) {
if (locksz != 0) {
/* allocate 2 cache lines or at least one spinlock per cpu */
nblocks = max_t(unsigned int,
2 * L1_CACHE_BYTES / sizeof(spinlock_t),
1);
nblocks = max(2U * L1_CACHE_BYTES / locksz, 1U);
nblocks = roundup_pow_of_two(nblocks * num_possible_cpus());
/* no more locks than number of hash buckets */
nblocks = min(nblocks, hashinfo->ehash_mask + 1);
hashinfo->ehash_locks = kmalloc_array(nblocks, sizeof(spinlock_t),
hashinfo->ehash_locks = kmalloc_array(nblocks, locksz,
GFP_KERNEL | __GFP_NOWARN);
if (!hashinfo->ehash_locks)
hashinfo->ehash_locks = vmalloc(nblocks * sizeof(spinlock_t));
hashinfo->ehash_locks = vmalloc(nblocks * locksz);
if (!hashinfo->ehash_locks)
return -ENOMEM;