| commit | 199f45c45e8d4f58a5f568464be933534460eb82 | [log] [tgz] |
|---|---|---|
| author | Milton Miller <miltonm@bga.com> | Fri Oct 10 01:56:44 2008 +0000 |
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | Mon Oct 13 16:24:19 2008 +1100 |
| tree | 488e5c5e4530313aff840fc5a2074a26f6233172 | |
| parent | 2172fe8704a1df7cbb988ae1ec4edbfef3e28860 [diff] |
powerpc/xics: Reduce and comment xics IPI use of memory barriers A single full sync (mb()) is requrired to order the mmio to the qirr reg with the set or clear of the message word. However, test_and_clear_bit has the effect of smp_mb() and we are not doing any other io from here, so we don't need a mb per bit processed. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>