Sinan Kaya
64e2c6738b
io: define several IO & PIO barrier types for the asm-generic version
...
Getting ready to harden readX()/writeX() and inX()/outX() semantics for the
generic implementation.
Defining two set of macros as __io_br() and __io_ar() to indicate actions
to be taken before and after MMIO read.
Defining two set of macros as __io_bw() and __io_aw() to indicate actions
to be taken before and after MMIO write.
Defining two set of macros as __io_pbw() and __io_paw() to indicate actions
to be taken before and after Port IO write.
Defining two set of macros as __io_pbr() and __io_par() to indicate actions
to be taken before and after Port IO read.
If rmb() is available for the architecture, prefer rmb() as the default
implementation of __io_ar()/__io_par().
If wmb() is available for the architecture, prefer wmb() as the default
implementation of __io_bw()/__io_pbw().
Signed-off-by: Sinan Kaya <okaya@codeaurora.org >
Signed-off-by: Arnd Bergmann <arnd@arndb.de >
2018-04-06 12:01:28 +02:00
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