linux-kernel - Re: [PATCH v17 02/16] preempt: Track NMI nesting to separate per-CPU counter

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Message-ID: <20260203114454.GM1282955@noisy.programming.kicks-ass.net>
Date: Tue, 3 Feb 2026 12:44:54 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Lyude Paul <lyude@...hat.com>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Boqun Feng <boqun.feng@...il.com>,
	Daniel Almeida <daniel.almeida@...labora.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
	Waiman Long <longman@...hat.com>,
	Joel Fernandes <joelagnelf@...dia.com>
Subject: Re: [PATCH v17 02/16] preempt: Track NMI nesting to separate per-CPU
 counter

On Wed, Jan 21, 2026 at 05:39:05PM -0500, Lyude Paul wrote:

> diff --git a/kernel/softirq.c b/kernel/softirq.c
> index 77198911b8dd4..af47ea23aba3b 100644
> --- a/kernel/softirq.c
> +++ b/kernel/softirq.c
> @@ -88,6 +88,8 @@ EXPORT_PER_CPU_SYMBOL_GPL(hardirqs_enabled);
>  EXPORT_PER_CPU_SYMBOL_GPL(hardirq_context);
>  #endif
>  
> +DEFINE_PER_CPU(unsigned int, nmi_nesting);

What happened with putting this in the same line as preempt_count?