| commit | 199f45c45e8d4f58a5f568464be933534460eb82 | |
| author | Milton Miller <miltonm@bga.com> | |
| Fri, 10 Oct 2008 01:56:44 +0000 (10 01:56 +0000) | ||
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | |
| Mon, 13 Oct 2008 05:24:19 +0000 (13 16:24 +1100) | ||
| tree | 488e5c5e4530313aff840fc5a2074a26f6233172 | treesnapshot (tar.gz zip) |
| parent | 2172fe8704a1df7cbb988ae1ec4edbfef3e28860 | commitdiff |
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>
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>
| arch/powerpc/platforms/pseries/xics.c | diffblobblamehistory |