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

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Message-ID: <20180105100300.j3svmcvvpfe2iows@pathway.suse.cz>
Date:   Fri, 5 Jan 2018 11:03:00 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     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 Mon 2017-12-11 21:50:12, Sergey Senozhatsky wrote:
> 	Hello,
> 
> 	A rather automatic replacement of print_symbol()
> with direct printk() calls. print_symbol() uses extra stack
> buffer (KSYM_SYMBOL_LEN 128 bytes) and, basically, should
> be identical to printk(%pS).

To make it clear, both print_symbol() and printk(%pS)
print the adress using sprint_symbol(). And even printk(%pS)
uses the buffer on the stack, see:

char *symbol_string(char *buf, char *end, void *ptr,
		    struct printf_spec spec, const char *fmt)
{
[...]
	char sym[KSYM_SYMBOL_LEN];
[...]
		sprint_symbol(sym, value);
}

Anyway, print_symbol() is an old weird API and it would be nice
to eventually get rid of it. I could take this patches into
printk.git. Would you mind if I change the commit messages
to something like?:

    print_symbol() is an old weird API. It has been
    obsoleted by printk() and %pS format specifier.

Best Regards,
Petr