linux-kernel - Re: [PATCH] x86/iperm: remove unused pointers

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Date:   Tue, 21 Jan 2020 09:16:01 -0500
From:   Waiman Long <longman@...hat.com>
To:     Alex Shi <alex.shi@...ux.alibaba.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Andy Lutomirski <luto@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/iperm: remove unused pointers

On 1/21/20 3:40 AM, Alex Shi wrote:
> No one use the prev/next pointers in its function after commit 22fe5b0439dd
> ("x86/ioperm: Move TSS bitmap update to exit to user work"). So better to
> remove them.
>
> Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
> Cc: Thomas Gleixner <tglx@...utronix.de> 
> Cc: Ingo Molnar <mingo@...hat.com> 
> Cc: Borislav Petkov <bp@...en8.de> 
> Cc: "H. Peter Anvin" <hpa@...or.com> 
> Cc: x86@...nel.org 
> Cc: Andy Lutomirski <luto@...nel.org> 
> Cc: Rik van Riel <riel@...riel.com> 
> Cc: Dave Hansen <dave.hansen@...el.com> 
> Cc: Waiman Long <longman@...hat.com> 
> Cc: Marcelo Tosatti <mtosatti@...hat.com> 
> Cc: linux-kernel@...r.kernel.org 
> ---
>  arch/x86/kernel/process.c | 4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
> index 61e93a318983..839b5244e3b7 100644
> --- a/arch/x86/kernel/process.c
> +++ b/arch/x86/kernel/process.c
> @@ -615,12 +615,8 @@ void speculation_ctrl_update_current(void)
>  
>  void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p)
>  {
> -	struct thread_struct *prev, *next;
>  	unsigned long tifp, tifn;
>  
> -	prev = &prev_p->thread;
> -	next = &next_p->thread;
> -
>  	tifn = READ_ONCE(task_thread_info(next_p)->flags);
>  	tifp = READ_ONCE(task_thread_info(prev_p)->flags);
>  

Acked-by: Waiman Long <longman@...hat.com>