CONFIG_ARM64_FORCE_52BIT: Force 52-bit virtual addresses for userspace

General informations

The Linux kernel configuration item CONFIG_ARM64_FORCE_52BIT:

• prompt: Force 52-bit virtual addresses for userspace
• type: bool
• depends on: CONFIG_ARM64_VA_BITS_52 && CONFIG_EXPERT
• defined in arch/arm64/Kconfig
• found in Linux kernels: 5.0–5.19, 6.0–6.12, 6.13-rc+HEAD

Help text

For systems with 52-bit userspace VAs enabled, the kernel will attempt to maintain compatibility with older software by providing 48-bit VAs unless a hint is supplied to mmap.

This configuration option disables the 48-bit compatibility logic, and forces all userspace addresses to be 52-bit on HW that supports it. One should only enable this configuration option for stress testing userspace memory management code. If unsure say N here.

Hardware

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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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