linux-kernel - Re: [PATCH 2/2] x86/entry: Remove `regs' parameter from idtentry_exit_cond

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Date:   Tue, 30 Jun 2020 13:14:30 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin " <hpa@...or.com>
Subject: Re: [PATCH 2/2] x86/entry: Remove `regs' parameter from
 idtentry_exit_cond_resched()

On Tue, Jun 30, 2020 at 12:22:09PM +0200, Sebastian Andrzej Siewior wrote:
> The `regs' parameter is not used in idtentry_exit_cond_resched() and can
> be removed.
> 
> Remove the `regs' parameter.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
>  arch/x86/entry/common.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
> index 212382f61b8e4..652dce37643b4 100644
> --- a/arch/x86/entry/common.c
> +++ b/arch/x86/entry/common.c
> @@ -610,7 +610,7 @@ bool noinstr idtentry_enter_cond_rcu(struct pt_regs *regs)
>  	return false;
>  }
>  
> -static void idtentry_exit_cond_resched(struct pt_regs *regs, bool may_sched)
> +static void idtentry_exit_cond_resched(bool may_sched)

This is a style question; so far all idtentry_*() functions have regs
passed. In the lockdep-vs-nmi series I introduce
idtentry_{enter,exit}_nmi() both having an unused regs argument.

Not sure which way around I feel on this.