CONFIG_HAVE_ARCH_VMAP_STACK:

General informations

The Linux kernel configuration item CONFIG_HAVE_ARCH_VMAP_STACK:

• prompt:
• type: bool
• depends on: (none)
• defined in arch/Kconfig
• found in Linux kernels: 4.9–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

An arch should select this symbol if it can support kernel stacks in vmalloc space. This means:

- vmalloc space must be large enough to hold many kernel stacks. This may rule out many 32-bit architectures.

- Stacks in vmalloc space need to work reliably. For example, if vmap page tables are created on demand, either this mechanism needs to work while the stack points to a virtual address with unpopulated page tables or arch code (switch_to() and switch_mm(), most likely) needs to ensure that the stack's page table entries are populated before running on a possibly unpopulated stack.

- If the stack overflows into a guard page, something reasonable should happen. The definition of "reasonable" is flexible, but instantly rebooting without logging anything would be unfriendly.

Hardware

LKDDb

Raw data from LKDDb:

• (none)

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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