linux-kernel - Re: [PATCH 1/2] context_tracking: Provide helper to determine if we're in IRQ

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Message-ID: <cb7ed8e5-220d-41f0-8743-5a7a4627443d@nvidia.com>
Date: Mon, 9 Jun 2025 14:05:16 -0400
From: Joel Fernandes <joelagnelf@...dia.com>
To: linux-kernel@...r.kernel.org, Frederic Weisbecker <frederic@...nel.org>,
 "Paul E. McKenney" <paulmck@...nel.org>
Cc: Xiongfeng Wang <wangxiongfeng2@...wei.com>, rcu@...r.kernel.org,
 bpf@...r.kernel.org
Subject: Re: [PATCH 1/2] context_tracking: Provide helper to determine if
 we're in IRQ



On 6/9/2025 2:01 PM, Joel Fernandes wrote:
> context_tracking keeps track of whether we're handling IRQ well after
> the preempt masks give take it off their books. We need this
> functionality in a follow-up patch to fix a bug. Provide a helper API
> for the same.
> 
> Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
> ---
>  include/linux/context_tracking_irq.h |  2 ++
>  kernel/context_tracking.c            | 12 ++++++++++++
>  2 files changed, 14 insertions(+)
> 
> diff --git a/include/linux/context_tracking_irq.h b/include/linux/context_tracking_irq.h
> index 197916ee91a4..35a5ad971514 100644
> --- a/include/linux/context_tracking_irq.h
> +++ b/include/linux/context_tracking_irq.h
> @@ -9,6 +9,7 @@ void ct_irq_enter_irqson(void);
>  void ct_irq_exit_irqson(void);
>  void ct_nmi_enter(void);
>  void ct_nmi_exit(void);
> +bool ct_in_irq(void);
>  #else
>  static __always_inline void ct_irq_enter(void) { }
>  static __always_inline void ct_irq_exit(void) { }
> @@ -16,6 +17,7 @@ static inline void ct_irq_enter_irqson(void) { }
>  static inline void ct_irq_exit_irqson(void) { }
>  static __always_inline void ct_nmi_enter(void) { }
>  static __always_inline void ct_nmi_exit(void) { }
> +static inline bool ct_in_irq(void) { return false; }
I did s/inline/__always_inline/ here. Will send with next posting.

thanks,

 - Joel