ARM: reintroduce ioremap_cached() for creating cached I/O mappings

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The original ARM-only ioremap flavor 'ioremap_cached' has been renamed
to 'ioremap_cache' to align with other architectures, and subsequently
abused in generic code to map things like firmware tables in memory.
For that reason, there is currently an effort underway to deprecate
ioremap_cache, whose semantics are poorly defined, and which is typed
with an __iomem annotation that is inappropriate for mappings of ordinary
memory.

However, original users of ioremap_cached() used it in a context where
the I/O connotation is appropriate, and replacing those instances with
memremap() does not make sense. So let's revive ioremap_cached(), so
that we can change back those original users before we drop ioremap_cache
entirely in favor of memremap.

Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

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Ard Biesheuvel 2016-03-04 10:05:39 +01:00

parent 9735a22799

commit 20c5ea4fc1

3 changed files with 14 additions and 0 deletions

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6

arch/arm/include/asm/io.h

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4

arch/arm/mm/ioremap.c

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4

arch/arm/mm/nommu.c

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