io: define stronger ordering for the default readX() implementation

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The default implementation of mapping readX() to __raw_readX() is wrong.
readX() has stronger ordering semantics. Compiler is allowed to reorder
__raw_readX() against the memory accesses following register read.

Use the previously defined __io_ar() and __io_br() macros to harden
code generation according to architecture support.

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

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Sinan Kaya 2018-04-05 09:09:10 -04:00 • committed by Arnd Bergmann

parent 64e2c6738b

commit 032d59e1cd

1 changed files with 24 additions and 4 deletions

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28

include/asm-generic/io.h

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