Messages in this thread | | | From | John Garry <> | Subject | [PATCH 0/3] io.h, logic_pio: Allow barriers for inX() and outX() be overridden | Date | Wed, 18 Mar 2020 23:55:32 +0800 |
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Since commits a7851aa54c0c ("io: change outX() to have their own IO barrier overrides") and 87fe2d543f81 ("io: change inX() to have their own IO barrier overrides"), the outX() and inX() functions have memory barriers which can be overridden per-arch.
However, under CONFIG_INDIRECT_PIO, logic_pio defines its own version of inX() and outX(), which still use readb et al. For these, the barrier after a raw read is weaker than it otherwise would be.
This series generates consistent behaviour for logic_pio, by defining generic _inX() and _outX() in asm-generic/io.h, and using those in logic_pio. Generic _inX() and _outX() have per-arch overrideable barriers.
The topic was discussed there originally: https://lore.kernel.org/lkml/2e80d7bc-32a0-cc40-00a9-8a383a1966c2@huawei.com/
A small tidy-up patch is included.
I hope that series can go through the arm-soc tree, as with other recent logic_pio changes.
John Garry (3): io: Provide _inX() and _outX() logic_pio: Improve macro argument name logic_pio: Use _inX() and _outX()
include/asm-generic/io.h | 64 +++++++++++++++++++++++++++++++++--------------- lib/logic_pio.c | 22 ++++++++--------- 2 files changed, 55 insertions(+), 31 deletions(-)
-- 2.12.3
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