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authorStefan Richter <stefanr@s5r6.in-berlin.de>2008-11-29 19:00:56 +0100
committerStefan Richter <stefanr@s5r6.in-berlin.de>2009-01-04 23:50:38 +0100
commitc8a12d45d543905a2718fccafd612edbd73a1341 (patch)
treeb14e18eb68be2da1e9971ce5094ccc54b9030ef8
parentd6f95a3d14dc403881b23ad268ec1e3600c4e6b4 (diff)
firewire: reorder struct fw_card for better cache efficiency
topology_map is by far the largest member in struct fw_card. Move it to the very end of the struct so that card pointer dereferences have better chances to hit the CPU cache. This requires to increase the topology_map backing store to the size specified in IEEE 1394, i.e. 256 rather than 255 quadlets. Otherwise the topology_map response handler may access invalid memory. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
-rw-r--r--drivers/firewire/fw-transaction.h10
1 files changed, 3 insertions, 7 deletions
diff --git a/drivers/firewire/fw-transaction.h b/drivers/firewire/fw-transaction.h
index 5a57bb897e2..c9ab12a15f6 100644
--- a/drivers/firewire/fw-transaction.h
+++ b/drivers/firewire/fw-transaction.h
@@ -237,13 +237,6 @@ struct fw_card {
int link_speed;
int config_rom_generation;
- /*
- * We need to store up to 4 self ID for a maximum of 63
- * devices plus 3 words for the topology map header.
- */
- u32 topology_map[252 + 3];
- u32 broadcast_channel;
-
spinlock_t lock; /* Take this lock when handling the lists in
* this struct. */
struct fw_node *local_node;
@@ -261,6 +254,9 @@ struct fw_card {
struct delayed_work work;
int bm_retries;
int bm_generation;
+
+ u32 broadcast_channel;
+ u32 topology_map[(CSR_TOPOLOGY_MAP_END - CSR_TOPOLOGY_MAP) / 4];
};
static inline struct fw_card *fw_card_get(struct fw_card *card)