linux-kernel - Re: [PATCH v3 5/7] kprobes/x86: Fix %p uses in error messages

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Date:   Fri, 27 Apr 2018 08:58:17 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Ananth N Mavinakayanahalli <ananth@...ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jon Medhurst <tixy@...aro.org>,
        Will Deacon <will.deacon@....com>,
        Arnd Bergmann <arnd@...db.de>,
        David Howells <dhowells@...hat.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        "Tobin C . Harding" <me@...in.cc>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        akpm@...ux-foundation.org, acme@...nel.org, rostedt@...dmis.org,
        brueckner@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
        stable@...r.kernel.org
Subject: Re: [PATCH v3 5/7] kprobes/x86: Fix %p uses in error messages


* Masami Hiramatsu <mhiramat@...nel.org> wrote:

>  	    (addr < (u8 *) jprobe_return_end)) {
>  		if (stack_addr(regs) != saved_sp) {
>  			struct pt_regs *saved_regs = &kcb->jprobe_saved_regs;
> -			printk(KERN_ERR
> -			       "current sp %p does not match saved sp %p\n",
> +			pr_err("current sp %pS does not match saved sp %pS\n",
>  			       stack_addr(regs), saved_sp);

Why does this use %pS? Stack pointers are typically pointing into general kernel 
RAM, which is totally pointless to display 'symbolically'.

Thanks,

	Ingo