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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
parent b14b9d25a3
commit 7c703e54cc
15 changed files with 8 additions and 47 deletions
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2
lib/scatterlist.c
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@@ -271,7 +271,7 @@ int __sg_alloc_table(struct sg_table *table, unsigned int nents,
if (nents == 0)
return -EINVAL;
#ifndef CONFIG_ARCH_HAS_SG_CHAIN
#ifdef CONFIG_ARCH_NO_SG_CHAIN
if (WARN_ON_ONCE(nents > max_ents))
return -EINVAL;
#endif