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| author | Jesse Gross <jesse@nicira.com> | 2013-09-05 12:17:05 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-09-05 15:54:37 -0400 |
| commit | 0d40f75bdab241868c0eb6f97aef9f8b3a66f7b3 (patch) | |
| tree | 45b6907b65ab9d68e76150440c571c3bc30dcece | |
| parent | 06c54055bebf919249aa1eb68312887c3cfe77b4 (diff) | |
| download | lwn-0d40f75bdab241868c0eb6f97aef9f8b3a66f7b3.tar.gz lwn-0d40f75bdab241868c0eb6f97aef9f8b3a66f7b3.zip | |
openvswitch: Fix alignment of struct sw_flow_key.
sw_flow_key alignment was declared as " __aligned(__alignof__(long))".
However, this breaks on the m68k architecture where long is 32 bit in
size but 16 bit aligned by default. This aligns to the size of a long to
ensure that we can always do comparsions in full long-sized chunks. It
also adds an additional build check to catch any reduction in alignment.
CC: Andy Zhou <azhou@nicira.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/openvswitch/flow.c | 1 | ||||
| -rw-r--r-- | net/openvswitch/flow.h | 2 |
2 files changed, 2 insertions, 1 deletions
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c index ad1aeeb4f373..fb36f8565161 100644 --- a/net/openvswitch/flow.c +++ b/net/openvswitch/flow.c @@ -1981,6 +1981,7 @@ nla_put_failure: * Returns zero if successful or a negative error code. */ int ovs_flow_init(void) { + BUILD_BUG_ON(__alignof__(struct sw_flow_key) % __alignof__(long)); BUILD_BUG_ON(sizeof(struct sw_flow_key) % sizeof(long)); flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow), 0, diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h index b65f885ac3dc..212fbf7510c4 100644 --- a/net/openvswitch/flow.h +++ b/net/openvswitch/flow.h @@ -125,7 +125,7 @@ struct sw_flow_key { } nd; } ipv6; }; -} __aligned(__alignof__(long)); +} __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */ struct sw_flow { struct rcu_head rcu; |