From: Peter Zijlstra <peterz@infradead.org>
To: Heiko Carstens <hca@linux.ibm.com>
Cc: Lyude Paul <lyude@redhat.com>,
rust-for-linux@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Boqun Feng <boqun.feng@gmail.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Vasily Gorbik <gor@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Arnd Bergmann <arnd@arndb.de>,
Juergen Christ <jchrist@linux.ibm.com>,
Ilya Leoshkevich <iii@linux.ibm.com>,
"moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)"
<linux-arm-kernel@lists.infradead.org>,
open list <linux-kernel@vger.kernel.org>,
"open list:S390 ARCHITECTURE" <linux-s390@vger.kernel.org>,
"open list:GENERIC INCLUDE/ASM HEADER FILES"
<linux-arch@vger.kernel.org>
Subject: Re: [PATCH v9 2/9] preempt: Introduce __preempt_count_{sub, add}_return()
Date: Fri, 28 Feb 2025 10:24:05 +0100 [thread overview]
Message-ID: <20250228092405.GE5880@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <20250228091509.8985B18-hca@linux.ibm.com>
On Fri, Feb 28, 2025 at 10:15:09AM +0100, Heiko Carstens wrote:
> I couldn't find any cover letter for the whole patch series which describes
> what this is about, and why it is needed.
> It looks like some Rust enablement?
Yeah, more or less.
It's replacing local_irq_save() and all related functions
(spin_lock_irqsave etc..) that take a flags argument with this new thing
that frobs a recursion count in preempt_count(), obviating the need to
carry the local flags argument around.
This is nice, even for C code, less flags muck to carry around.
It would be even better if they then went and deleted all of the _irq /
_irqsave nonsense entirely.
Yes, that's going to be a big patch :-)
Also, IIRC there is some arch stuff that comes unstuck if you do this
blindly (I tried at some point, it didn't boot).
next prev parent reply other threads:[~2025-02-28 9:24 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-27 22:10 [PATCH v9 0/9] Refcounted interrupts, SpinLockIrq for rust Lyude Paul
2025-02-27 22:10 ` [PATCH v9 1/9] preempt: Introduce HARDIRQ_DISABLE_BITS Lyude Paul
2025-02-27 23:09 ` Steven Rostedt
2025-02-28 1:33 ` Boqun Feng
2025-03-03 21:55 ` Lyude Paul
2025-02-28 7:57 ` Peter Zijlstra
2025-02-27 22:10 ` [PATCH v9 2/9] preempt: Introduce __preempt_count_{sub, add}_return() Lyude Paul
2025-02-28 1:49 ` Boqun Feng
2025-02-28 9:15 ` Heiko Carstens
2025-02-28 9:24 ` Peter Zijlstra [this message]
2025-04-30 21:38 ` Lyude Paul
2025-05-05 9:56 ` Heiko Carstens
2025-03-01 18:49 ` kernel test robot
2025-03-01 19:00 ` kernel test robot
2025-02-27 22:10 ` [PATCH v9 3/9] irq & spin_lock: Add counted interrupt disabling/enabling Lyude Paul
2025-03-01 20:19 ` kernel test robot
2025-02-27 22:10 ` [PATCH v9 4/9] rust: Introduce interrupt module Lyude Paul
2025-03-02 16:56 ` Dirk Behme
2025-02-27 22:10 ` [PATCH v9 5/9] rust: helper: Add spin_{un,}lock_irq_{enable,disable}() helpers Lyude Paul
2025-02-27 22:10 ` [PATCH v9 6/9] rust: sync: Add SpinLockIrq Lyude Paul
2025-03-02 11:51 ` Guangbo Cui
2025-03-03 22:15 ` Lyude Paul
2025-03-02 17:07 ` Dirk Behme
2025-04-04 21:56 ` Lyude Paul
2025-02-27 22:10 ` [PATCH v9 7/9] rust: sync: Introduce lock::Backend::Context Lyude Paul
2025-03-03 14:22 ` Dirk Behme
2025-02-27 22:10 ` [PATCH v9 8/9] rust: sync: lock: Add `Backend::BackendInContext` Lyude Paul
2025-03-03 14:23 ` Dirk Behme
2025-02-27 22:10 ` [PATCH v9 9/9] locking: Switch to _irq_{disable,enable}() variants in cleanup guards Lyude Paul
2025-04-05 8:25 ` Guangbo Cui
2025-04-05 8:55 ` Guangbo Cui
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