Re: [PATCH v2 3/3] mm: skip KASAN tagging for page-allocated page tables

[Catalin Marinas]

On Tue, Mar 24, 2026 at 01:26:29PM +0000, Muhammad Usama Anjum wrote:
> Page tables are always accessed via the linear mapping with a match-all
> tag, so HW-tag KASAN never checks them. For page-allocated tables (PTEs
> and PGDs etc), avoid the tag setup and poisoning overhead by using
> __GFP_SKIP_KASAN. SLUB-backed page tables are unchanged for now. (They
> aren't widely used and require more SLUB related skip logic. Leave it
> later.)
> 
> Reviewed-by: Ryan Roberts <ryan.roberts@xxxxxxx>
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@xxxxxxx>

Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>