Eliminate the impact of the KERNEL_VERSION parameter

[KairusZhang]

KERNEL_VERSION ?= 6.12.8 delete the 6.12.8, it will affect the version of Linux-qemu download

[gemini-code-assist]

Summary of Changes

Hello @KairusZhang, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves an issue where a specific kernel version was hardcoded within the Makefile, which was reported to affect the download process for Linux-qemu. By removing the explicit version number, the system can now dynamically determine the appropriate kernel version or allow it to be set externally, thereby preventing potential conflicts and enhancing the flexibility of the build process.

Highlights

• KERNEL_VERSION Default: The default assignment for the KERNEL_VERSION variable in the Makefile has been removed. Previously, it was hardcoded to 6.12.8.

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[gemini-code-assist]

Code Review

The pull request correctly removes the hardcoded default for KERNEL_VERSION in the Makefile to allow for more flexibility with different hypervisors. My review includes one comment pointing out that the help documentation for this variable is now misleading and should be updated to prevent confusion.

[gemini-code-assist]

Removing the hardcoded default for KERNEL_VERSION is a good change for flexibility across different hypervisors. However, this makes the help text on line 153 potentially misleading. It states the default is 6.12.8, which is now only true for the default cloud_hypervisor (due to a fallback in its build script) but not necessarily for others like qemu. To avoid confusion for future developers, please update the help text to clarify that the default depends on the hypervisor.