[Deepin-Kernel-SIG] [linux 6.6.y] [deepin] arm64: increase CMA_SIZE_MBYTES=128

[opsiff]

deepin inclusion
category: other

• DRAM-less NVMe requires a sufficiently large amount of CMA memory.

Link: https://salsa.debian.org/kernel-team/linux/-/merge_requests/1878

Summary by Sourcery

Enhancements:

• Adjust Deepin ARM64 desktop defconfig to allocate a larger contiguous CMA memory region for hardware that requires it.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Increase the default CMA (Contiguous Memory Allocator) reserved size to 128MB in the Deepin arm64 desktop defconfig to support DRAM-less NVMe devices that require more CMA memory.

File-Level Changes

Change	Details	Files
Increase CMA reserved memory size to 128MB in the Deepin arm64 desktop kernel configuration.	Update the CMA_SIZE_MBYTES kernel configuration option value to 128 in the Deepin arm64 desktop defconfig Regenerate or adjust the defconfig so that the new CMA size is applied for Deepin arm64 desktop builds	arch/arm64/configs/deepin_arm64_desktop_defconfig

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[deepin-ci-robot]

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[Avenger-285714]

what about other arch

[Copilot]

Pull request overview

This PR aims to improve Deepin’s ARM64 desktop kernel configuration for hardware (e.g., DRAM-less NVMe) that benefits from a larger Contiguous Memory Allocator (CMA) pool by increasing the configured CMA size.

Changes:

• Increase the configured CMA size to 128MiB in the Deepin ARM64 desktop defconfig.

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[opsiff]

what about other arch

x86 don`t need it, see:
config CMA_SIZE_MBYTES
int "Size in Mega Bytes"
depends on !CMA_SIZE_SEL_PERCENTAGE
default 0 if X86
default 16
help
Defines the size (in MiB) of the default memory area for Contiguous
Memory Allocator. If the size of 0 is selected, CMA is disabled by
default, but it can be enabled by passing cma=size[MG] to the kernel.

[opsiff]

what about other arch

LoongArch f789c9e set CONFIG_CMA_SIZE_MBYTES=0 by your and threre =0 by chenhuacai fc56292.