linux-hardening - RE: [PATCH] printk: add cpu id information to printk() output

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Message-ID: <SJ1PR11MB608326C26516C66ADC0526D8FCF6A@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date:   Fri, 15 Sep 2023 16:31:03 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Enlin Mu <enlin.mu@...look.com>,
        "pmladek@...e.com" <pmladek@...e.com>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "john.ogness@...utronix.de" <john.ogness@...utronix.de>,
        "senozhatsky@...omium.org" <senozhatsky@...omium.org>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "gpiccoli@...lia.com" <gpiccoli@...lia.com>,
        "enlin.mu@...soc.com" <enlin.mu@...soc.com>,
        "enlinmu@...il.com" <enlinmu@...il.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>
Subject: RE: [PATCH] printk: add cpu id information to printk() output

> +	return in_task() ? task_pid_nr(current) | (smp_processor_id() << CPU_ID_SHIFT) :

There are contexts and CONFIG options around pre-emption where smp_processor_id()
will throw a warning. Use raw_smp_processor_id().

-Tony