From: Andreas Hindborg <a.hindborg@kernel.org>
To: Lyude Paul <lyude@redhat.com>,
rust-for-linux@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Boqun Feng <boqun.feng@gmail.com>,
linux-kernel@vger.kernel.org,
Daniel Almeida <daniel.almeida@collabora.com>
Cc: Joel Fernandes <joelagnelf@nvidia.com>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>
Subject: Re: [PATCH v13 02/17] preempt: Reduce NMI_MASK to single bit and restore HARDIRQ_BITS
Date: Tue, 04 Nov 2025 13:15:34 +0100 [thread overview]
Message-ID: <87ecqe8049.fsf@t14s.mail-host-address-is-not-set> (raw)
In-Reply-To: <20251013155205.2004838-3-lyude@redhat.com>
Lyude Paul <lyude@redhat.com> writes:
> From: Joel Fernandes <joelagnelf@nvidia.com>
>
> Now that NMI nesting is tracked in a separate per-CPU variable
> (nmi_nesting), we no longer need multiple bits in preempt_count
> for NMI tracking. Reduce NMI_BITS from 3 to 1, using it only to
> detect if we're in an NMI.
>
> Signed-off-by: Joel Fernandes <joelaf@google.com>
> Signed-off-by: Lyude Paul <lyude@redhat.com>
The commit summary is mentioning HARDIRQ_BITS, but I don't think that
change is part of this commit.
Best regards,
Andreas Hindborg
next prev parent reply other threads:[~2025-11-04 12:15 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-13 15:48 [PATCH v13 00/17] Refcounted interrupts, SpinLockIrq for rust Lyude Paul
2025-10-13 15:48 ` [PATCH v13 01/17] preempt: Track NMI nesting to separate per-CPU counter Lyude Paul
2025-10-13 16:19 ` Lyude Paul
2025-10-13 16:32 ` Miguel Ojeda
2025-10-13 20:00 ` Peter Zijlstra
2025-10-13 21:27 ` Joel Fernandes
2025-10-14 8:25 ` Peter Zijlstra
2025-10-14 17:59 ` Joel Fernandes
2025-10-14 19:37 ` Peter Zijlstra
2025-10-14 10:48 ` Peter Zijlstra
2025-10-14 17:55 ` Joel Fernandes
2025-10-14 19:43 ` Peter Zijlstra
2025-10-14 22:05 ` Joel Fernandes
2025-10-20 20:44 ` Joel Fernandes
2025-10-30 22:56 ` Joel Fernandes
2025-10-13 15:48 ` [PATCH v13 02/17] preempt: Reduce NMI_MASK to single bit and restore HARDIRQ_BITS Lyude Paul
2025-11-04 12:15 ` Andreas Hindborg [this message]
2025-10-13 15:48 ` [PATCH v13 03/17] preempt: Introduce HARDIRQ_DISABLE_BITS Lyude Paul
2025-10-31 14:59 ` Andreas Hindborg
2025-10-31 19:59 ` Boqun Feng
2025-10-13 15:48 ` [PATCH v13 04/17] preempt: Introduce __preempt_count_{sub, add}_return() Lyude Paul
2025-11-04 12:30 ` Andreas Hindborg
2025-10-13 15:48 ` [PATCH v13 05/17] irq & spin_lock: Add counted interrupt disabling/enabling Lyude Paul
2025-10-15 20:54 ` Bart Van Assche
2025-10-16 8:15 ` Peter Zijlstra
2025-10-17 6:44 ` Boqun Feng
2025-10-16 21:24 ` David Laight
2025-10-17 6:48 ` Boqun Feng
2025-11-04 12:45 ` Andreas Hindborg
2025-11-19 21:47 ` Lyude Paul
2025-10-13 15:48 ` [PATCH v13 06/17] irq: Add KUnit test for refcounted interrupt enable/disable Lyude Paul
2025-10-13 15:48 ` [PATCH v13 07/17] rust: Introduce interrupt module Lyude Paul
2025-11-04 12:55 ` Andreas Hindborg
2025-10-13 15:48 ` [PATCH v13 08/17] rust: helper: Add spin_{un,}lock_irq_{enable,disable}() helpers Lyude Paul
2025-11-04 12:56 ` Andreas Hindborg
2025-10-13 15:48 ` [PATCH v13 09/17] rust: sync: Add SpinLockIrq Lyude Paul
2025-11-04 13:09 ` Andreas Hindborg
2025-10-13 15:48 ` [PATCH v13 10/17] rust: sync: Introduce lock::Backend::Context Lyude Paul
2025-10-13 15:48 ` [PATCH v13 11/17] rust: sync: lock: Add `Backend::BackendInContext` Lyude Paul
2025-11-05 12:45 ` Andreas Hindborg
2025-10-13 15:48 ` [PATCH v13 12/17] rust: sync: lock/global: Rename B to G in trait bounds Lyude Paul
2025-10-13 15:48 ` [PATCH v13 13/17] rust: sync: Add a lifetime parameter to lock::global::GlobalGuard Lyude Paul
2025-10-13 15:48 ` [PATCH v13 14/17] rust: sync: Expose lock::Backend Lyude Paul
2025-10-13 15:48 ` [PATCH v13 15/17] rust: sync: lock/global: Add Backend parameter to GlobalGuard Lyude Paul
2025-10-13 15:48 ` [PATCH v13 16/17] rust: sync: lock/global: Add BackendInContext support to GlobalLock Lyude Paul
2025-10-13 15:48 ` [PATCH v13 17/17] locking: Switch to _irq_{disable,enable}() variants in cleanup guards Lyude Paul
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