[PATCH mm-hotfixes v2 4/4] arm64: remove redundant concurrent ptdump UAF mitigation

[Kiryl Shutsemau]

On Sun, Jul 12, 2026 at 11:42:27AM +0100, Lorenzo Stoakes wrote:
> This partially reverts commit fa93b45fd397 ("arm64: Enable vmalloc-huge
> with ptdump"), retaining vmalloc-huge support but eliminating the now
> redundant mitigation against a race between huge vmap page table freeing
> and ptdump, as this issue has now been fixed at core.
> 
> We also simultaneously remove the arm64 if-deffery when acquiring the mmap
> read lock upon vmap huge page table promotion as it is no longer required.
> 
> Note that this patch relies on the preceding vmalloc patch, and should not
> be backported alone.
> 
> Fixes: fa93b45fd397 ("arm64: Enable vmalloc-huge with ptdump")
> Cc: stable at vger.kernel.org
> Reviewed-by: Dev Jain <dev.jain at arm.com>
> Acked-by: Mike Rapoport (Microsoft) <rppt at kernel.org>
> Signed-off-by: Lorenzo Stoakes <ljs at kernel.org>

Acked-by: Kiryl Shutsemau (Meta) <kas at kernel.org>

-- 
  Kiryl Shutsemau / Kirill A. Shutemov