CONFIG_RMW_INSNS: Use read-modify-write instructions

General informations

The Linux kernel configuration item CONFIG_RMW_INSNS has multiple definitions:

Use read-modify-write instructions found in arch/m68k/Kconfig.cpu

The configuration item CONFIG_RMW_INSNS:

• prompt: Use read-modify-write instructions
• type: bool
• depends on: CONFIG_ADVANCED && ! CONFIG_CPU_HAS_NO_CAS
• defined in arch/m68k/Kconfig.cpu
• found in Linux kernels: 3.2–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.17, 6.18-rc+HEAD

Help text

This allows to use certain instructions that work with indivisible read-modify-write bus cycles. While this is faster than the workaround of disabling interrupts, it can conflict with DMA ( = direct memory access) on many Amiga systems, and it is also said to destabilize other machines. It is very likely that this will cause serious problems on any Amiga or Atari Medusa if set. The only configuration where it should work are 68030-based Ataris, where it apparently improves performance. But you've been warned! Unless you really know what you are doing, say N. Try Y only if you're quite adventurous.

Use read-modify-write instructions found in arch/m68k/Kconfig.mmu

The configuration item CONFIG_RMW_INSNS:

• prompt: Use read-modify-write instructions
• type: bool
• depends on: CONFIG_ADVANCED
• defined in arch/m68k/Kconfig.mmu
• found in Linux kernels: 2.6.39, 3.0–3.1

Help text

This allows to use certain instructions that work with indivisible read-modify-write bus cycles. While this is faster than the workaround of disabling interrupts, it can conflict with DMA ( = direct memory access) on many Amiga systems, and it is also said to destabilize other machines. It is very likely that this will cause serious problems on any Amiga or Atari Medusa if set. The only configuration where it should work are 68030-based Ataris, where it apparently improves performance. But you've been warned! Unless you really know what you are doing, say N. Try Y only if you're quite adventurous.

Use read-modify-write instructions found in arch/m68k/Kconfig

The configuration item CONFIG_RMW_INSNS:

• prompt: Use read-modify-write instructions
• type: bool
• depends on: CONFIG_ADVANCED
• defined in arch/m68k/Kconfig
• found in Linux kernels: 2.5.45–2.5.75, 2.6.0–2.6.38

Help text

This allows to use certain instructions that work with indivisible read-modify-write bus cycles. While this is faster than the workaround of disabling interrupts, it can conflict with DMA ( = direct memory access) on many Amiga systems, and it is also said to destabilize other machines. It is very likely that this will cause serious problems on any Amiga or Atari Medusa if set. The only configuration where it should work are 68030-based Ataris, where it apparently improves performance. But you've been warned! Unless you really know what you are doing, say N. Try Y only if you're quite adventurous.

Hardware

LKDDb

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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