From: Eric Dumazet <eduma...@google.com>
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: 095dc8e0c368 ("tcp: fix/cleanup inet_ehash_locks_alloc()")
Reported-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Eric Dumazet <eduma...@google.com>
---
net/ipv4/inet_hashtables.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 5f9b063bbe8a..0cb9165421d4 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -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;
--
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