Re: [PATCH] arm64/cpufeature: annotate arm64_use_ng_mappings with ro_after_init to prevent wrong idmap generation

On Fri, May 02, 2025 at 06:41:33PM +0200, Ard Biesheuvel wrote:

Making arm64_use_ng_mappings __ro_after_init seems like a useful change by itself, so I am not objecting to that. But we don't solve it more fundamentally, please at least add a big fat comment why it is important that the variable remains there.

Maybe something like the section reference checker we use for __init - verify that the early C code does not refer anything in the BSS section.