linux-kernel - Re: [PATCH 06/10] x86/entry: Move nmi entry/exit into common code

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Message-ID: <874kmk6298.fsf@nanos.tec.linutronix.de>
Date:   Fri, 23 Oct 2020 23:50:11 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     ira.weiny@...el.com, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Ira Weiny <ira.weiny@...el.com>, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 06/10] x86/entry: Move nmi entry/exit into common code

On Thu, Oct 22 2020 at 15:26, ira weiny wrote:

> From: Thomas Gleixner <tglx@...utronix.de>
>
> Lockdep state handling on NMI enter and exit is nothing specific to X86. It's
> not any different on other architectures. Also the extra state type is not
> necessary, irqentry_state_t can carry the necessary information as well.
>
> Move it to common code and extend irqentry_state_t to carry lockdep
> state.

This lacks something like:

 [ Ira: Made the states a union as they are mutually exclusive and added
        the missing kernel doc ]

Hrm.
 
>  #ifndef irqentry_state
>  typedef struct irqentry_state {
> -	bool	exit_rcu;
> +	union {
> +		bool	exit_rcu;
> +		bool	lockdep;
> +	};
>  } irqentry_state_t;
>  #endif

  -E_NO_KERNELDOC

Thanks,

        tglx