Re: [PATCH 2/2] Revert "arm64: Enable vmalloc-huge with ptdump"

[Mike Rapoport]

On Fri, Jul 10, 2026 at 11:49:19AM +0100, Lorenzo Stoakes wrote:
> Subject: [PATCH 2/2] Revert "arm64: Enable vmalloc-huge with ptdump"

Without reading the full changelog this sounds like you are disabling
vmalloc-huge with ptdump ;-)

How about "remove redundant locking guarding ptdump against vmalloc-huge"?

> 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 ifdeffery when acquiring the mmap
> read lock upon vmap huge page table promotion as it is no longer required.
> 
> Signed-off-by: Lorenzo Stoakes <ljs@xxxxxxxxxx>B

Acked-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>

> ---
>  arch/arm64/include/asm/ptdump.h |  2 --
>  arch/arm64/mm/mmu.c             | 43 ++++-------------------------------------
>  arch/arm64/mm/ptdump.c          | 11 ++---------
>  mm/vmalloc.c                    | 15 +++-----------
>  4 files changed, 9 insertions(+), 62 deletions(-)

-- 
Sincerely yours,
Mike.