linux-kernel - Re: [PATCH 00/13] replace print

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Message-ID: <20180105122334.GB417@jagdpanzerIV>
Date:   Fri, 5 Jan 2018 21:23:34 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Petr Mladek <pmladek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Salter <msalter@...hat.com>,
        Tony Luck <tony.luck@...el.com>,
        David Howells <dhowells@...hat.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Guan Xuetao <gxt@...c.pku.edu.cn>,
        Borislav Petkov <bp@...en8.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Vineet Gupta <vgupta@...opsys.com>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.org,
        linux-ia64@...r.kernel.org, linux-am33-list@...hat.com,
        linux-sh@...r.kernel.org, linux-edac@...r.kernel.org,
        x86@...nel.org, linux-snps-arc@...ts.infradead.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCH 00/13] replace print_symbol() with printk()-s

On (01/05/18 21:01), Sergey Senozhatsky wrote:
[..]
> but, print_symbol() is compiled out on !CONFIG_KALLSYMS systems. so,
> basically, we compile out some of errors print outs; even more, on ia64
> ia64_do_show_stack() does nothing when there is no CONFIG_KALLSYMS [all
> ia64 defconfigs have KALLSYMS_ALL enabled]. printk(%pS), unlike
> print_symbol(), is not compiled out and prints the function address
> when symbolic name is not available. but, at a glance, print_symbol()
> in most of the cases has printk(registers) next to it or before it, so
> it doesn't look like we are introducing a regression here by switching
> to printk(%pS).

well, if this is a problem, then we can have

static inline void print_symbol(const char *fmt, unsigned long addr)
{
       printk(fmt, addr);
}

for CONFIG_KALLSYMS builds, and an empty print_symbol() for !CONFIG_KALLSYMS
builds.


but we still have tons printk(%pS) in the kernel and even print_ip_sym()
(which is not compiled out on !CONFIG_KALLSYMS). so it seems to me that
we can drop print_symbol()/__print_symbol() and switch to printk(%pS)
after all.

	-ss