From: Shrikanth Hegde <sshegde@linux.ibm.com>
To: Boqun Feng <boqun@kernel.org>,
Madhavan Srinivasan <maddy@linux.ibm.com>,
"Christophe Leroy (CS GROUP)" <chleroy@kernel.org>
Cc: "Ingo Molnar" <mingo@kernel.org>, "Will Deacon" <will@kernel.org>,
"Waiman Long" <longman@redhat.com>, "Gary Guo" <gary@garyguo.net>,
"Alice Ryhl" <aliceryhl@google.com>,
"Lyude Paul" <lyude@redhat.com>,
"Daniel Almeida" <daniel.almeida@collabora.com>,
"Onur Özkan" <work@onurozkan.dev>,
"Miguel Ojeda" <ojeda@kernel.org>,
"Danilo Krummrich" <dakr@kernel.org>,
linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org,
"Heiko Carstens" <hca@linux.ibm.com>,
"Peter Zijlstra" <peterz@infradead.org>
Subject: Re: [PATCH v4 12/17] s390/preempt: Enable HAS_SEPARATE_PREEMPT_RESCHED_BITS
Date: Wed, 5 Aug 2026 01:57:04 +0530 [thread overview]
Message-ID: <367a9709-eb79-4579-9405-fb8d89576413@linux.ibm.com> (raw)
In-Reply-To: <20260804161447.84806-13-boqun@kernel.org>
+maddy, christophe,
On 8/4/26 9:44 PM, Boqun Feng wrote:
> From: Heiko Carstens <hca@linux.ibm.com>
>
> Convert s390's preempt_count to 64 bit, and change the preempt
> primitives accordingly.
>
> + union {
> + struct {
> + __u32 need_resched; /* 0x03a8 */
> + __u32 count; /* 0x03ac */
> + } preempt;
> + __u64 preempt_count; /* 0x03a8 */
> + };
This is interesting. So arm64, s390 will have similar implementation
w.r.t to preempt_count.
I guess PoC that i was trying for ppc64 is worth pursuing even more,
since ppc64 is one missing major arch which still uses old method
of querying tif_need_resched.
With similar change ppc64 can set HAS_SEPARATE_PREEMPT_RESCHED_BITS too.
next prev parent reply other threads:[~2026-08-04 20:27 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-04 16:14 [PATCH v4 00/17] Refcounted interrupt disable and SpinLockIrq for Rust Boqun Feng
2026-08-04 16:14 ` [PATCH v4 01/17] preempt: Track NMI nesting to separate per-CPU counter Boqun Feng
2026-08-08 20:48 ` [tip: locking/core] " tip-bot2 for Joel Fernandes
2026-08-04 16:14 ` [PATCH v4 02/17] preempt: Introduce HARDIRQ_DISABLE_BITS Boqun Feng
2026-08-05 6:31 ` Peter Zijlstra
2026-08-05 6:59 ` Boqun Feng
2026-08-08 20:48 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2026-08-04 16:14 ` [PATCH v4 03/17] preempt: Introduce __preempt_count_{sub,add}_return() Boqun Feng
2026-08-08 20:48 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2026-08-04 16:14 ` [PATCH v4 04/17] openrisc: Include <linux/cpumask.h> in smp.h Boqun Feng
2026-08-08 20:48 ` [tip: locking/core] " tip-bot2 for Lyude Paul
2026-08-04 16:14 ` [PATCH v4 05/17] irq & spin_lock: Add counted interrupt disabling/enabling Boqun Feng
2026-08-04 18:20 ` Boqun Feng
2026-08-04 18:26 ` [PATCH v4.1 " Boqun Feng
2026-08-08 20:48 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2026-08-10 8:57 ` [tip: locking/core] irq,spin_lock: " tip-bot2 for Boqun Feng
2026-08-04 20:51 ` [PATCH v4 05/17] irq & spin_lock: " Shrikanth Hegde
2026-08-04 21:08 ` Boqun Feng
2026-08-05 6:36 ` Peter Zijlstra
2026-08-05 7:07 ` Boqun Feng
2026-08-05 7:09 ` Shrikanth Hegde
2026-08-05 7:19 ` Boqun Feng
2026-08-05 13:53 ` Boqun Feng
2026-08-05 14:10 ` Shrikanth Hegde
2026-08-05 14:20 ` Boqun Feng
2026-08-05 14:56 ` Shrikanth Hegde
2026-08-05 15:11 ` Boqun Feng
2026-08-05 16:53 ` Shrikanth Hegde
2026-08-05 17:38 ` Boqun Feng
2026-08-05 18:07 ` Boqun Feng
2026-08-04 16:14 ` [PATCH v4 06/17] irq: Add KUnit test for refcounted interrupt enable/disable Boqun Feng
2026-08-08 20:48 ` [tip: locking/core] " tip-bot2 for Lyude Paul
2026-08-10 8:57 ` tip-bot2 for Lyude Paul
2026-08-04 16:14 ` [PATCH v4 07/17] locking: Switch to _irq_{disable,enable}() variants in cleanup guards Boqun Feng
2026-08-08 20:48 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2026-08-10 8:57 ` tip-bot2 for Boqun Feng
2026-08-04 16:14 ` [PATCH v4 08/17] sched: Remove the unused preempt_offset parameter of __cant_sleep() Boqun Feng
2026-08-08 20:48 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2026-08-10 8:57 ` tip-bot2 for Boqun Feng
2026-08-04 16:14 ` [PATCH v4 09/17] sched: Avoid signed comparison of preempt_count() in __cant_migrate() Boqun Feng
2026-08-08 20:48 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2026-08-10 8:57 ` tip-bot2 for Boqun Feng
2026-08-04 16:14 ` [PATCH v4 10/17] preempt: Introduce HAS_SEPARATE_PREEMPT_RESCHED_BITS Boqun Feng
2026-08-04 20:11 ` Shrikanth Hegde
2026-08-05 6:54 ` Boqun Feng
2026-08-05 7:15 ` Shrikanth Hegde
2026-08-05 7:27 ` Boqun Feng
2026-08-06 0:58 ` Boqun Feng
2026-08-04 21:09 ` Shrikanth Hegde
2026-08-04 23:14 ` Boqun Feng
2026-08-08 20:48 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2026-08-10 8:57 ` tip-bot2 for Boqun Feng
2026-08-04 16:14 ` [PATCH v4 11/17] arm64: sched/preempt: Enable HAS_SEPARATE_PREEMPT_RESCHED_BITS Boqun Feng
2026-08-08 20:48 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2026-08-10 8:57 ` tip-bot2 for Boqun Feng
2026-08-04 16:14 ` [PATCH v4 12/17] s390/preempt: " Boqun Feng
2026-08-04 20:27 ` Shrikanth Hegde [this message]
2026-08-05 9:42 ` Peter Zijlstra
2026-08-05 12:37 ` Shrikanth Hegde
2026-08-08 20:48 ` [tip: locking/core] " tip-bot2 for Heiko Carstens
2026-08-10 8:57 ` tip-bot2 for Heiko Carstens
2026-08-04 16:14 ` [PATCH v4 13/17] rust: Introduce interrupt module Boqun Feng
2026-08-04 16:14 ` [PATCH v4 14/17] rust: helper: Add spin_{un,}lock_irq_{enable,disable}() helpers Boqun Feng
2026-08-04 16:14 ` [PATCH v4 15/17] rust: sync: Use super::* in spinlock.rs Boqun Feng
2026-08-04 16:14 ` [PATCH v4 16/17] rust: sync: Add SpinLockIrq Boqun Feng
2026-08-04 16:14 ` [PATCH v4 17/17] rust: sync: Introduce SpinLockIrq::lock_with() and friends Boqun Feng
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