Re: [PATCH v3 6/7] alpha: invalidate the local context in flush_tlb_mm()

[Matt Turner]

On Wed, Sep 23, 2026 at 09:47:49AM +0200, Magnus Lindholm wrote:
> The uniprocessor implementation in asm/tlbflush.h already has the missing
> branch. Counted over a fork-heavy run, flush_tlb_mm() was entered with the
> mm not this CPU's active_mm 2934 times, and 632 times while otherwise idle.

With the hugetlb series applied this path gets busier: every hugetlb
flush there goes through flush_tlb_range(), so unmapping or migrating a
hugetlb folio from another context ends up here with a foreign mm.
That might also give you the reproducer this patch lacks: move_pages()
on another process's hugetlb mapping, with the caller pinned to the
CPU the target last ran on.

Reviewed-by: Matt Turner <mattst88@xxxxxxxxx>