CONFIG_DATA_SHIFT: Data shift

General informations

The Linux kernel configuration item CONFIG_DATA_SHIFT:

• prompt: Data shift
• type: int
• depends on: ( CONFIG_DATA_SHIFT_BOOL ) && ( CONFIG_STRICT_KERNEL_RWX && CONFIG_PPC64 ) && ( CONFIG_STRICT_KERNEL_RWX && CONFIG_PPC_BOOK3S_32 ) && (( CONFIG_DEBUG_PAGEALLOC || CONFIG_KFENCE ) && CONFIG_PPC_BOOK3S_32 ) && (( CONFIG_STRICT_KERNEL_RWX || CONFIG_DEBUG_PAGEALLOC || CONFIG_KFENCE ) && CONFIG_PPC_8xx && \) && (( CONFIG_STRICT_KERNEL_RWX || CONFIG_DEBUG_PAGEALLOC || CONFIG_KFENCE ) && CONFIG_PPC_8xx ) && ( CONFIG_STRICT_KERNEL_RWX && CONFIG_PPC_85xx )
• defined in arch/powerpc/Kconfig
• found in Linux kernels: 5.1–5.19, 6.0–6.11, 6.12-rc+HEAD

Help text

On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO. Smaller is the alignment, greater is the number of necessary DBATs.

On 8xx, large pages (512kb or 8M) are used to map kernel linear memory. Aligning to 8M reduces TLB misses as only 8M pages are used in that case. If PIN_TLB is selected, it must be aligned to 8M as 8M pages will be pinned.

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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