Re: [PATCH] arm64/module: Support for patching modules during runtime

[Marc Zyngier <maz@kernel.org>]

On Mon, 11 Aug 2025 08:37:32 +0100,
fanqincui <fanqincui@163.com> wrote:
> 
> Hi will,
> Yes, you are right. The alternative callback function lives inside the module.
> This callback function is actually similar to kvm_update_va_mask in KVM;
> 
> The module's callback function calculates some values based on
> the current CPU features and then performs the replacement.
> 
> The .text.alternative_cb section is actually marked as SHF_EXECINSTR | SHF_ALLOC
> during compilation, so intersections() includes this section and sets it as executable later.

I'm worried there is a chicken-and-egg problem here. What if the
callback itself requires patching via some other alternative? Is there
a guarantee that this always performed in the correct order?

	M.

-- 
Without deviation from the norm, progress is not possible.