RFR: 8348384: RISC-V: Disable auto-enable Vector on buggy kernels [v3]

[Fei Yang]

On Mon, 27 Jan 2025 07:52:49 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> Hi please consider!
>> 
>> Linux kernels pre-6.9 can copy a dirty v-state during signal return path:
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/riscv/kernel/signal.c?h=v6.13-rc1&id=c27fa53b858b4ee6552a719aa599c250cf98a586
>> 
>> We should not auto-enable vector with such kernel, as we must be able to receive signals during the execution of vector code.
>> 
>> Manual tested pre and post 6.9 as expected.
>> 
>> Thanks, Robbin
>
> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fixed log

Thanks for the update.

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Marked as reviewed by fyang (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23256#pullrequestreview-2574724927