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: Tue, 1 Sep 2026 13:21:02 +0200 [thread overview]
Message-ID: <20260901112102.14482D13-hca@linux.ibm.com> (raw)
In-Reply-To: <75462b8e-b190-4870-8fd6-22d1e4d89139-agordeev@linux.ibm.com>
On Tue, Sep 01, 2026 at 01:16:58PM +0200, Alexander Gordeev wrote:
> On Thu, Aug 27, 2026 at 01:40:01PM +0200, Alexander Gordeev wrote:
> > On Thu, Aug 27, 2026 at 10:11:56AM +0200, Heiko Carstens wrote:
> > > Imho the "final" version should either be implemented that it can go
> > > without disabling bottom halves, or, if that is not worth the effort,
> > > even disable interrupts, just to avoid other surprises.
> >
> > Yes, that would be the last resort.
>
> So leaving local_bh_enable|disable() while adding VM_BUG_ON(in_hardirq())
> could actually work.
>
> Also, I do not see how the code could be rearranged to avoid BH disable.
Ok, then let's move forward with the current implementation.
Thanks for looking into this!
next prev parent reply other threads:[~2026-09-01 11:21 UTC|newest]
Thread overview: 18+ 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 [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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