linux-kernel - Re: [PATCH -next v1] x86/apic: Reduce print level of CPU limit announcement

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <fef570d91276280f055a0b1c2561b3dd8e20a0c3.camel@perches.com>
Date:   Wed, 27 Mar 2019 02:17:40 -0700
From:   Joe Perches <joe@...ches.com>
To:     Leon Romanovsky <leon@...nel.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86 <x86@...nel.org>
Cc:     Leon Romanovsky <leonro@...lanox.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        linux-pm <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next v1] x86/apic: Reduce print level of CPU limit
 announcement

On Wed, 2019-03-27 at 11:09 +0200, Leon Romanovsky wrote:
> Kernel is booted with less possible CPUs (possible_cpus kernel boot
> option) than available CPUs will have prints like this:
[]
> diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
[]
> @@ -2305,9 +2305,9 @@ int generic_processor_info(int apicid, int version)
>  	if (num_processors >= nr_cpu_ids) {
>  		int thiscpu = max + disabled_cpus;
> 
> -		pr_warning("APIC: NR_CPUS/possible_cpus limit of %i "
> -			   "reached. Processor %d/0x%x ignored.\n",
> -			   max, thiscpu, apicid);
> +		pr_debug(
> +			"APIC: NR_CPUS/possible_cpus limit of %i reached. Processor %d/0x%x ignored.\n",
> +			max, thiscpu, apicid);

2 lines please

		pr_debug("APIC: etc...",
			 max, thiscpu, ...);

And this would probably be better as

		printk(KERN_DEBUG "APIC: etc...",
		 ...)

to avoid the need to compile with DEBUG or enable
with CONFIG_DYNAMIC_DEBUG