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## Motivation This is a follow-up fix for [PR #5018](https://github.com/ROCm/rocm-libraries/pull/5018). [PR #5018](https://github.com/ROCm/rocm-libraries/pull/5018) added LLC-aware FMHA head grouping / head-major scheduling on RDNA, but it also introduced Linux-only code paths, including `<dirent.h>`, which break Windows builds. This change fixes that by guarding the Linux-specific LLC probing logic so non-Linux platforms can still build correctly. ## Technical Details - Guard `<dirent.h>` with `#ifdef __linux__` - Guard KFD sysfs traversal logic with `#if defined(__linux__)` - On non-Linux platforms, return `0` from `get_kfd_sysfs_llc_cache_bytes()` - Preserve existing fallback behavior through: - `CK_TILE_FMHA_LLC_CACHE_MB` - arch-based default LLC sizes - no head grouping when no LLC size can be resolved ## Test Plan <!-- Explain any relevant testing done to verify this PR. --> ## Test Result <!-- Briefly summarize test outcomes. --> ## Submission Checklist - [ ] Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.