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| author | Milton Miller <miltonm@bga.com> | 2008-10-10 03:56:44 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-10-13 07:24:19 +0200 |
| commit | 199f45c45e8d4f58a5f568464be933534460eb82 (patch) | |
| tree | 488e5c5e4530313aff840fc5a2074a26f6233172 /arch/powerpc/include/asm/vdso.h | |
| parent | powerpc/xics: Make printk format strings fit on one line (diff) | |
| download | linux-199f45c45e8d4f58a5f568464be933534460eb82.tar.xz linux-199f45c45e8d4f58a5f568464be933534460eb82.zip | |
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>
Diffstat (limited to 'arch/powerpc/include/asm/vdso.h')
0 files changed, 0 insertions, 0 deletions