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| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2008-11-29 21:00:56 +0300 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2009-01-05 01:50:38 +0300 |
| commit | c8a12d45d543905a2718fccafd612edbd73a1341 (patch) | |
| tree | b14e18eb68be2da1e9971ce5094ccc54b9030ef8 /drivers/firewire | |
| parent | d6f95a3d14dc403881b23ad268ec1e3600c4e6b4 (diff) | |
| download | linux-c8a12d45d543905a2718fccafd612edbd73a1341.tar.xz | |
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>
Diffstat (limited to 'drivers/firewire')
| -rw-r--r-- | drivers/firewire/fw-transaction.h | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/drivers/firewire/fw-transaction.h b/drivers/firewire/fw-transaction.h index 5a57bb897e23..c9ab12a15f6e 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) |