linux-kernel - Re: [PATCH] x86: init: Remove raw kernel pointer from printk

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Message-ID: <alpine.DEB.2.21.1809282141410.1432@nanos.tec.linutronix.de>
Date:   Fri, 28 Sep 2018 21:48:40 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jeff loughlin <loughlinjd@...il.com>
cc:     mingo@...hat.com, bp@...en8.de, hpa@...or.com, x86@...nel.org,
        pombredanne@...b.com, brijesh.singh@....com,
        thomas.lendacky@....com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: init: Remove raw kernel pointer from printk

Jeff, 

On Fri, 28 Sep 2018, Jeff loughlin wrote:

> From: Jeff Loughlin <loughlinjd@...il.com>
> 
>     printk message in set_real_mode_mem() contains a raw kernel pointer, which printk rightly changes to (ptrval).

Please format your changelog properly next time. Left aligned and line
breaks around 78 characters.

>     This is useless in the dmesg log and should be removed.

Agreed, (ptrval) is pretty useless, but this is a debug printk and the real
address is not useless for debugging, so just removing it is not
necessarily the best solution.

>     Signed-off-by: Jeff Loughlin <loughlinjd@...il.com>
> ---
>  arch/x86/realmode/init.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
> index d101058..d76a138 100644
> --- a/arch/x86/realmode/init.c
> +++ b/arch/x86/realmode/init.c
> @@ -20,8 +20,8 @@ void __init set_real_mode_mem(phys_addr_t mem, size_t size)
>  	void *base = __va(mem);
>  
>  	real_mode_header = (struct real_mode_header *) base;
> -	printk(KERN_DEBUG "Base memory trampoline at [%p] %llx size %zu\n",
> -	       base, (unsigned long long)mem, size);
> +	printk(KERN_DEBUG "Base memory trampoline at %llx size %zu\n",
> +	       (unsigned long long)mem, size);

Please check your patches with scripts/checkpatch.pl next time. It would
have told you to change that printk(KERN_DEBUG) to pr_debug()

Thanks,

	tglx