docs/memory-barriers.txt: Update I/O section to be clearer about CPU vs thread

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The revised I/O ordering section of memory-barriers.txt introduced in
4614bbdee3 ("docs/memory-barriers.txt: Rewrite "KERNEL I/O BARRIER
EFFECTS" section") loosely refers to "the CPU", whereas the ordering
guarantees generally apply within a thread of execution that can migrate
between cores, with the scheduler providing the relevant barrier
semantics.

Reword the section to refer to "CPU thread" and call out ordering of
MMIO writes separately from ordering of writes to memory. Ben also
spotted that the string accessors are native-endian, so fix that up too.

Link: https://lkml.kernel.org/r/080d1ec73e3e29d6ffeeeb50b39b613da28afb37.camel@kernel.crashing.org
Fixes: 4614bbdee3 ("docs/memory-barriers.txt: Rewrite "KERNEL I/O BARRIER EFFECTS" section")
Reported-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Will Deacon 2019-04-12 13:42:18 +01:00

parent 0cde62a46e

commit 9726840d9c

1 changed files with 40 additions and 27 deletions

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Documentation/memory-barriers.txt

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