Claude review: drm/panthor: set __GFP_SKIP_KASAN

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Overall Series Review

Subject: drm/panthor: set __GFP_SKIP_KASAN
Author: Chia-I Wu via B4 Relay <devnull+olvaffe.gmail.com@kernel.org>
Patches: 3
Reviewed: 2026-05-16T13:08:46.783545

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This is a single, well-motivated patch that fixes a real KASAN invalid-access bug on CONFIG_KASAN_HW_TAGS=y systems with MTE-capable hardware (recent Snapdragon SoCs). The problem is clearly explained: `shmem_swapin_cluster` can swap in pages belonging to other PROT_MTE mappings using panthor's GFP flags, and without `__GFP_SKIP_KASAN`, the page allocator assigns a specific KASAN tag to the kernel mapping instead of the match-all tag, leading to tag mismatch crashes.

The fix is correct. The approach of deriving the flags from `GFP_HIGHUSER_MOVABLE` rather than directly adding `__GFP_SKIP_KASAN` to the existing expression is a reasonable choice that better matches the semantic intent — these are user-facing pages that should behave like `GFP_HIGHUSER_MOVABLE` except they must not be movable (because panthor pins them).

**Verdict: The patch looks correct and ready for merging**, with minor style observations below.

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