linux-kernel - Re: [PATCH v4 06/35] cleanup: Basic compatibility with context analysis

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Message-ID: <aUFeBHuBJr-Y512D@elver.google.com>
Date: Tue, 16 Dec 2025 14:26:28 +0100
From: Marco Elver <elver@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Boqun Feng <boqun.feng@...il.com>, Ingo Molnar <mingo@...nel.org>,
	Will Deacon <will@...nel.org>,
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Subject: Re: [PATCH v4 06/35] cleanup: Basic compatibility with context
 analysis

On Tue, Dec 16, 2025 at 01:23PM +0100, Peter Zijlstra wrote:
> On Mon, Dec 15, 2025 at 04:53:18PM +0100, Marco Elver wrote:
> > One observation from the rebase: Generally synchronization primitives
> > do not change much and the annotations are relatively stable, but e.g.
> > RCU & sched (latter is optional and depends on the sched-enablement
> > patch) receive disproportionally more changes, and while new
> > annotations required for v6.19-rc1 were trivial, it does require
> > compiling with a Clang version that does produce the warnings to
> > notice.
> 
> I have:
> 
> Debian clang version 22.0.0 (++20251023025710+3f47a7be1ae6-1~exp5)
> 
> I've not tried if that is new enough.

That's new enough - it's after
https://github.com/llvm/llvm-project/commit/7ccb5c08f0685d4787f12c3224a72f0650c5865e
which is the minimum required version.

> > While Clang 22-dev is being tested on CI, I doubt maintainers already
> > use it, so it's possible we'll see some late warnings due to missing
> > annotations when things hit -next. This might be an acceptable churn
> > cost, if we think the outcome is worthwhile. Things should get better
> > when Clang 22 is released properly, but until then things might be a
> > little bumpy if there are large changes across the core
> > synchronization primitives.
> 
> Yeah, we'll see how bad it gets, we can always disable it for
> COMPILE_TEST or so for a while.