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authorAndy Grover <andy.grover@oracle.com>2009-04-01 08:20:20 +0000
committerDavid S. Miller <davem@davemloft.net>2009-04-02 00:52:22 -0700
commit8cbd9606a6367c221a7bbcc47f3ab1a8c31b6437 (patch)
tree9ff2adf88be32383fd59dc133f1cd6670b9ee815 /net/rds/ib_cm.c
parent745cbccac3fe8cead529a1b3358e1e86a1505bfa (diff)
downloadlinux-8cbd9606a6367c221a7bbcc47f3ab1a8c31b6437.tar.bz2
RDS: Use spinlock to protect 64b value update on 32b archs
We have a 64bit value that needs to be set atomically. This is easy and quick on all 64bit archs, and can also be done on x86/32 with set_64bit() (uses cmpxchg8b). However other 32b archs don't have this. I actually changed this to the current state in preparation for mainline because the old way (using a spinlock on 32b) resulted in unsightly #ifdefs in the code. But obviously, being correct takes precedence. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds/ib_cm.c')
-rw-r--r--net/rds/ib_cm.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c
index 889ab0441359..f8e40e1a6038 100644
--- a/net/rds/ib_cm.c
+++ b/net/rds/ib_cm.c
@@ -636,7 +636,11 @@ void rds_ib_conn_shutdown(struct rds_connection *conn)
/* Clear the ACK state */
clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
- rds_ib_set_64bit(&ic->i_ack_next, 0);
+#ifdef KERNEL_HAS_ATOMIC64
+ atomic64_set(&ic->i_ack_next, 0);
+#else
+ ic->i_ack_next = 0;
+#endif
ic->i_ack_recv = 0;
/* Clear flow control state */
@@ -669,6 +673,9 @@ int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
INIT_LIST_HEAD(&ic->ib_node);
mutex_init(&ic->i_recv_mutex);
+#ifndef KERNEL_HAS_ATOMIC64
+ spin_lock_init(&ic->i_ack_lock);
+#endif
/*
* rds_ib_conn_shutdown() waits for these to be emptied so they