linux-kernel - Re: [PATCH] x86: mm: use WARN_ONCE instead of printk and WARN_ON

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Date:   Tue, 7 Dec 2021 15:10:12 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Qing Wang <wangqing@...o.com>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: mm: use WARN_ONCE instead of printk and WARN_ON_ONCE

On Tue, Dec 07, 2021 at 04:55:00AM -0800, Qing Wang wrote:
> From: Wang Qing <wangqing@...o.com>
> 
> Simply use WARN_ONCE instead of printk(KERN_WARNING, ...) and WARN_ON_ONCE.
> 
> Signed-off-by: Wang Qing <wangqing@...o.com>
> ---
>  arch/x86/mm/ioremap.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
> index 026031b..af9a321
> --- a/arch/x86/mm/ioremap.c
> +++ b/arch/x86/mm/ioremap.c
> @@ -195,9 +195,8 @@ __ioremap_caller(resource_size_t phys_addr, unsigned long size,
>  		return NULL;
>  
>  	if (!phys_addr_valid(phys_addr)) {
> -		printk(KERN_WARNING "ioremap: invalid physical address %llx\n",
> -		       (unsigned long long)phys_addr);
> -		WARN_ON_ONCE(1);
> +		WARN_ONCE(1, "ioremap: invalid physical address %llx\n",
> +			 (unsigned long long)phys_addr);
>  		return NULL;
>  	}
>  
> -- 

This is not an equivalent transformation.

-- 
Regards/Gruss,
    Boris.

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