diff options
| author | Lennert Buytenhek <buytenh@wantstofly.org> | 2007-03-31 12:03:20 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2007-04-01 22:38:36 +0100 |
| commit | 398e692fd5cecdd25d311b47bbae69f7bac3a3cb (patch) | |
| tree | f1852c28d9f9c47c4763607630ac3db1c91930d6 /arch/x86_64/lib/rwlock.S | |
| parent | 9a4d93d49d140c196020a1bae339efcf211cac03 (diff) | |
[ARM] 4298/1: fix memory barriers for DMA coherent and SMP platforms
This patch:
- Switches mb/rmb/wmb back to being full-blown DMBs on ARM SMP systems,
since mb/rmb/wmb are required to order Normal memory accesses as well.
- Enables the use of DMB and ISB on XSC3 (which is an ARMv5TE ISA core
but conforms to the ARMv6 memory ordering model and supports the
various ARMv6 barriers.)
- Makes DMA coherent platforms (only ixp23xx at the moment) map
mb/rmb/wmb to dmb(), as on DMA coherent platforms, DMA consistent
mappings are done as Normal mappings, which are weakly ordered.
Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Acked-by: David Howells <dhowells@redhat.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/x86_64/lib/rwlock.S')
0 files changed, 0 insertions, 0 deletions