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net: sctp: Don't use 64 kilobyte lookup table for four elements 

Seemingly innocuous sctp_trans_state_to_prio_map[] array
is way bigger than it looks, since
"[SCTP_UNKNOWN] = 2" expands into "[0xffff] = 2" !

This patch replaces it with switch() statement.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
CC: Vlad Yasevich <vyasevich@gmail.com>
CC: Neil Horman <nhorman@tuxdriver.com>
CC: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
CC: linux-sctp@vger.kernel.org
CC: netdev@vger.kernel.org
CC: linux-kernel@vger.kernel.org
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denys Vlasenko 2015-09-28 14:34:04 +02:00 committed by David S. Miller
parent 06a15f51cf
commit 2103d6b818
1 changed files with 11 additions and 9 deletions
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20
net/sctp/associola.c
View File

@ -1208,20 +1208,22 @@ void sctp_assoc_update(struct sctp_association *asoc,
* within this document.
*
* Our basic strategy is to round-robin transports in priorities
* according to sctp_state_prio_map[] e.g., if no such
* according to sctp_trans_score() e.g., if no such
* transport with state SCTP_ACTIVE exists, round-robin through
* SCTP_UNKNOWN, etc. You get the picture.
*/
static const u8 sctp_trans_state_to_prio_map[] = {
[SCTP_ACTIVE] = 3, /* best case */
[SCTP_UNKNOWN] = 2,
[SCTP_PF] = 1,
[SCTP_INACTIVE] = 0, /* worst case */
};
static u8 sctp_trans_score(const struct sctp_transport *trans)
{
return sctp_trans_state_to_prio_map[trans->state];
switch (trans->state) {
case SCTP_ACTIVE:
return 3; /* best case */
case SCTP_UNKNOWN:
return 2;
case SCTP_PF:
return 1;
default: /* case SCTP_INACTIVE */
return 0; /* worst case */
}
}
static struct sctp_transport *sctp_trans_elect_tie(struct sctp_transport *trans1,