linux-kernel - Re: [PATCH tip/locking/core] compiler-context-analysis: Support immediate acquisition after initialization

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20260116152741.GA19823@lst.de>
Date: Fri, 16 Jan 2026 16:27:41 +0100
From: Christoph Hellwig <hch@....de>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Christoph Hellwig <hch@....de>, Marco Elver <elver@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>, Will Deacon <will@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>, Waiman Long <longman@...hat.com>,
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
	Bart Van Assche <bvanassche@....org>
Subject: Re: [PATCH tip/locking/core] compiler-context-analysis: Support
 immediate acquisition after initialization

On Fri, Jan 16, 2026 at 04:20:16PM +0100, Peter Zijlstra wrote:
> is *much* clearer than something like:
> 
> 	spinlock_init(&obj->lock);
> 	// init
> 	spinlock_deinit(&obj->lock);
> 
> Exactly because it has explicit scope. (also my deinit naming might not
> be optimal, it is ambiguous at best, probably confusing).

WTF is spinlock_deinit even supposed to be?

I though this is about:

	spin_lock_init(&obj->lock);
	spin_lock(&obj->lock);

> Not to mention that the scope things are far more robust vs error paths.

They are just a really hacked up clumsy way to provide what a very
limited version of what the capability analys provides, while messing
up the code.