RFR: 8342953: RISC-V: Fix definition of RISCV_HWPROBE_EXT_ZVFHMIN

[Hamlin Li]

On Thu, 24 Oct 2024 11:05:20 GMT, Fei Yang <fyang at openjdk.org> wrote:

> Hi,
> 
> Please review this trivial change correcting definition of macro `RISCV_HWPROBE_EXT_ZVFHMIN`.
> 
> This macro is supposed to be used when making a `hwprobe` linux syscall for detecting the Zvfhmin extension. Current definition yields a negative 32bits value, messing up hwprobe result when Zvfhmin extension presents. Replace it by using a 1ULL bit shift value as done in kernel upstream [1]. Although it is not used by the JVM for now, it's better to correct it for consistency with the kernel upstream.
> 
> [1] https://github.com/torvalds/linux/commit/5ea6764d9095e234b024054f75ebbccc4f0eb146

Thanks for catching! Looks good, and trivial.

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Marked as reviewed by mli (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/21680#pullrequestreview-2392423957