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CONFIG_REGPARM: Use register arguments

General informations

The Linux kernel configuration item CONFIG_REGPARM has multiple definitions:

Use register arguments (EXPERIMENTAL) found in arch/i386/Kconfig

The configuration item CONFIG_REGPARM:

• prompt: Use register arguments (EXPERIMENTAL)
• type: bool
• depends on: CONFIG_EXPERIMENTAL
• defined in arch/i386/Kconfig
• found in Linux kernels: 2.6.4–2.6.16

Help text

Compile the kernel with -mregparm=3. This uses an different ABI and passes the first three arguments of a function call in registers. This will probably break binary only modules.

This feature is only enabled for gcc-3.0 and later - earlier compilers generate incorrect output with certain kernel constructs when -mregparm=3 is used.

Use register arguments found in arch/i386/Kconfig

The configuration item CONFIG_REGPARM:

• prompt: Use register arguments
• type: bool
• depends on: (none)
• defined in arch/i386/Kconfig
• found in Linux kernels: 2.6.17–2.6.19

Help text

Compile the kernel with -mregparm=3. This instructs gcc to use a more efficient function call ABI which passes the first three arguments of a function call via registers, which results in denser and faster code.

If this option is disabled, then the default ABI of passing arguments via the stack is used.

If unsure, say Y.

Hardware

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