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arch: switch the default on ARCH_HAS_SG_CHAIN

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These days architectures are mostly out of the business of dealing with
struct scatterlist at all, unless they have architecture specific iommu
drivers.  Replace the ARCH_HAS_SG_CHAIN symbol with a ARCH_NO_SG_CHAIN
one only enabled for architectures with horrible legacy iommu drivers
like alpha and parisc, and conditionally for arm which wants to keep it
disable for legacy platforms.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Christoph Hellwig 2018-11-09 09:51:00 +01:00
commit 7c703e54cc
15 changed files with 8 additions and 47 deletions
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