[PATCH] D135411: Add generic KCFI operand bundle lowering

[Sami Tolvanen via Phabricator via llvm-commits]

samitolvanen added a comment.

In D135411#3841693 <https://reviews.llvm.org/D135411#3841693>, @kees wrote:

> What's the best way to test this in the kernel? I assume add `ARCH_SUPPORTS_CFI_CLANG` to an arch, and see what blows up? :)

Yes, I think that's the best way.

> Have you tried this on any other arch yet?

The generic lowering pass is not ideal for kernel use as-is, because it doesn't generate a consistent machine instruction sequence, which makes error handling more difficult. The primary target audience here is firmware running on less common architectures.

That being said, I did compile a 64-bit MIPS kernel using this pass, but I didn't try booting it. I would expect to run into quite a few issues initially.


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https://reviews.llvm.org/D135411