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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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33
Documentation/features/io/sg-chain/arch-support.txt
View File

@@ -1,33 +0,0 @@
#
# Feature name: sg-chain
# Kconfig: ARCH_HAS_SG_CHAIN
# description: arch supports chained scatter-gather lists
#
-----------------------
| arch |status|
-----------------------
| alpha: | TODO |
| arc: | ok |
| arm: | ok |
| arm64: | ok |
| c6x: | TODO |
| h8300: | TODO |
| hexagon: | TODO |
| ia64: | ok |
| m68k: | TODO |
| microblaze: | TODO |
| mips: | TODO |
| nds32: | TODO |
| nios2: | TODO |
| openrisc: | TODO |
| parisc: | TODO |
| powerpc: | ok |
| riscv: | TODO |
| s390: | ok |
| sh: | TODO |
| sparc: | ok |
| um: | TODO |
| unicore32: | TODO |
| x86: | ok |
| xtensa: | TODO |
-----------------------