Re: [PATCH v3 tip/perf/core 2/4] mm: switch to 64-bit mm_lock_seq/vm_lock_seq on 64-bit architectures

On Thu, Oct 10, 2024 at 01:56:42PM GMT, Andrii Nakryiko wrote:

To increase mm->mm_lock_seq robustness, switch it from int to long, so
that it's a 64-bit counter on 64-bit systems and we can stop worrying
about it wrapping around in just ~4 billion iterations. Same goes for
VMA's matching vm_lock_seq, which is derived from mm_lock_seq.

I didn't use __u64 outright to keep 32-bit architectures unaffected, but
if it seems important enough, I have nothing against using __u64.

Suggested-by: Jann Horn <jannh@google.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

Reviewed-by: Shakeel Butt <shakeel.butt@linux.dev>