From: Heiko Carstens <hca@linux.ibm.com>
To: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Claudio Imbrenda <imbrenda@linux.ibm.com>,
Andrey Ryabinin <ryabinin.a.a@gmail.com>,
linux-s390@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com
Subject: Re: [PATCH v7 2/4] s390/mm: Batch PTE updates in lazy MMU mode
Date: Thu, 1 Oct 2026 17:41:17 +0200 [thread overview]
Message-ID: <20261001154117.23106Da3-hca@linux.ibm.com> (raw)
In-Reply-To: <15c64970-d54e-4b8f-96f6-50c021079a94-agordeev@linux.ibm.com>
On Thu, Oct 01, 2026 at 11:20:17AM +0200, Alexander Gordeev wrote:
> On Thu, Oct 01, 2026 at 10:21:43AM +0200, Heiko Carstens wrote:
> > On Thu, Oct 01, 2026 at 10:00:55AM +0200, Alexander Gordeev wrote:
> > > On Mon, Aug 24, 2026 at 12:40:48PM +0200, Heiko Carstens wrote:
> > Not really. But why is lazy_mmu_count 32 bit? Do you expect a nesting
> > level of 2^32? :) If you would reduce that to one byte you could use
> > tmy or cliy.
>
> Good point. But still, do you think it worth dropping the KASAN check?
KASAN check for lowcore? I don't think we care - this is initialized to zero
anyway, so what could go wrong? Also given how frequently these operations are
used, yes, please drop KASAN checks.
next prev parent reply other threads:[~2026-10-01 15:41 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-17 11:32 [PATCH v7 0/4] " Alexander Gordeev
2026-08-17 11:32 ` [PATCH v7 1/4] mm: Make lazy MMU mode context-aware Alexander Gordeev
2026-08-17 11:33 ` [PATCH v7 2/4] s390/mm: Batch PTE updates in lazy MMU mode Alexander Gordeev
2026-08-24 10:40 ` Heiko Carstens
2026-08-26 12:00 ` Alexander Gordeev
2026-08-26 13:02 ` Heiko Carstens
2026-08-26 14:34 ` Alexander Gordeev
2026-08-27 8:11 ` Heiko Carstens
2026-08-27 11:39 ` Alexander Gordeev
2026-09-01 11:16 ` Alexander Gordeev
2026-09-01 11:21 ` Heiko Carstens
2026-10-01 8:00 ` Alexander Gordeev
2026-10-01 8:21 ` Heiko Carstens
2026-10-01 9:20 ` Alexander Gordeev
2026-10-01 15:41 ` Heiko Carstens [this message]
2026-08-17 11:33 ` [PATCH v7 3/4] mm/kasan: Introduce helpers for lazy MMU mode sanitizer Alexander Gordeev
2026-08-17 22:11 ` Andrey Konovalov
2026-08-18 12:01 ` Alexander Gordeev
2026-08-24 9:56 ` Heiko Carstens
2026-08-25 7:50 ` Alexander Gordeev
2026-08-25 10:08 ` Heiko Carstens
2026-08-17 11:33 ` [PATCH v7 4/4] s390/mm: Lazy " Alexander Gordeev
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