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| author | Andy Grover <andy.grover@oracle.com> | 2009-04-01 08:20:20 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-04-02 00:52:22 -0700 |
| commit | 8cbd9606a6367c221a7bbcc47f3ab1a8c31b6437 (patch) | |
| tree | 9ff2adf88be32383fd59dc133f1cd6670b9ee815 /net/rds/rds.h | |
| parent | 745cbccac3fe8cead529a1b3358e1e86a1505bfa (diff) | |
| download | linux-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/rds.h')
| -rw-r--r-- | net/rds/rds.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/rds/rds.h b/net/rds/rds.h index 060400704979..619f0a30a4e5 100644 --- a/net/rds/rds.h +++ b/net/rds/rds.h @@ -28,6 +28,10 @@ */ #define RDS_PORT 18634 +#ifdef ATOMIC64_INIT +#define KERNEL_HAS_ATOMIC64 +#endif + #ifdef DEBUG #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args) #else |