On Tue, 25 May 2021 10:45:51 +0800, Jisheng Zhang wrote:

When we added KFENCE support for arm64, we intended that it would
force the entire linear map to be mapped at page granularity, but we
only enforced this in arch_add_memory() and not in map_mem(), so
memory mapped at boot time can be mapped at a larger granularity.

When booting a kernel with KFENCE=y and RODATA_FULL=n, this results in
the following WARNING at boot:

[...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64: mm: don't use CON and BLK mapping if KFENCE is enabled
      https://git.kernel.org/arm64/c/e69012400b0c

-- 
Catalin


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