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Commit 7c703e54 authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

arch: switch the default on ARCH_HAS_SG_CHAIN 



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: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarPalmer Dabbelt <palmer@sifive.com>
parent b14b9d25

Documentation/features/io/sg-chain/arch-support.txt

deleted100644 → 0
+0 −33
Original line number Diff line number Diff line 
#

# 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 |

    -----------------------

arch/alpha/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ config ALPHA 
	select ARCH_MIGHT_HAVE_PC_PARPORT

	select ARCH_MIGHT_HAVE_PC_SERIO

	select ARCH_NO_PREEMPT

	select ARCH_NO_SG_CHAIN

	select ARCH_USE_CMPXCHG_LOCKREF

	select HAVE_AOUT

	select HAVE_IDE

arch/arc/Kconfig

+0 −1
Original line number Diff line number Diff line
@@ -13,7 +13,6 @@ config ARC 
	select ARCH_HAS_PTE_SPECIAL

	select ARCH_HAS_SYNC_DMA_FOR_CPU

	select ARCH_HAS_SYNC_DMA_FOR_DEVICE

	select ARCH_HAS_SG_CHAIN

	select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC

	select BUILDTIME_EXTABLE_SORT

	select CLONE_BACKWARDS

arch/arm/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ config ARM 
	select ARCH_HAVE_CUSTOM_GPIO_H

	select ARCH_HAS_GCOV_PROFILE_ALL

	select ARCH_MIGHT_HAVE_PC_PARPORT

	select ARCH_NO_SG_CHAIN if !ARM_HAS_SG_CHAIN

	select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX

	select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT if CPU_V7

	select ARCH_SUPPORTS_ATOMIC_RMW
@@ -119,7 +120,6 @@ config ARM 
	  <http://www.arm.linux.org.uk/>.



config ARM_HAS_SG_CHAIN

	select ARCH_HAS_SG_CHAIN

	bool



config ARM_DMA_USE_IOMMU

arch/arm64/Kconfig

+0 −1
Original line number Diff line number Diff line
@@ -23,7 +23,6 @@ config ARM64 
	select ARCH_HAS_MEMBARRIER_SYNC_CORE

	select ARCH_HAS_PTE_SPECIAL

	select ARCH_HAS_SET_MEMORY

	select ARCH_HAS_SG_CHAIN

	select ARCH_HAS_STRICT_KERNEL_RWX

	select ARCH_HAS_STRICT_MODULE_RWX

	select ARCH_HAS_SYNC_DMA_FOR_DEVICE