Re: [PATCH v2] x86/mm/tlb: ignore f->new_tlb_gen when zero

[Nadav Amit]

On Jul 12, 2022, at 5:49 PM, Hugh Dickins <hughd@xxxxxxxxxx> wrote:

> ⚠ External Email
> 
> On Wed, 13 Jul 2022, Nadav Amit wrote:
>> On Jul 11, 2022, at 10:39 AM, Nadav Amit <namit@xxxxxxxxxx> wrote:
>>> On Jul 10, 2022, at 4:28 PM, Nadav Amit <nadav.amit@xxxxxxxxx> wrote:
>>>> From: Nadav Amit <namit@xxxxxxxxxx>
>>>> 
>>>> Commit aa44284960d5 ("x86/mm/tlb: Avoid reading mm_tlb_gen when
>>>> possible") introduced an optimization of skipping the flush if the TLB
>>>> generation that is flushed (as provided in flush_tlb_info) was already
>>>> flushed.
>>> 
>>> Dave,
>>> 
>>> Can you please review this patch today?
>>> 
>>> I feel bad (for a good reason) for breaking swap/migration.
>>> 
>>> Thanks,
>>> Nadav
>> 
>> Ping?
>> 
>> As you know, this really must go into 5.19 or otherwise aa44284960d5
>> reverted.
> 
> No, aa44284960d5 is not in 5.19-rc: it's in linux-next heading for 5.20.

Oh.. My bad. Thanks for clarifying Hugh.