linux-kernel - Re: [PATCH 13/13] arc: do not use __print

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Date:   Mon, 11 Dec 2017 08:28:35 -0800
From:   Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.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 <Vineet.Gupta1@...opsys.com>,
        Fengguang Wu <fengguang.wu@...el.com>
CC:     Steven Rostedt <rostedt@...dmis.org>,
        Petr Mladek <pmladek@...e.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-c6x-dev@...ux-c6x.org" <linux-c6x-dev@...ux-c6x.org>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        "linux-am33-list@...hat.com" <linux-am33-list@...hat.com>,
        "linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCH 13/13] arc: do not use __print_symbol()

On 12/11/2017 04:53 AM, Sergey Senozhatsky wrote:
> __print_symbol() uses extra stack space to sprintf() symbol
> information and then to feed that buffer to printk()
>
>    char buffer[KSYM_SYMBOL_LEN];
>
>    sprint_symbol(buffer, address);
>    printk(fmt, buffer);
>
> Replace __print_symbol() with a direct printk("%pS") call.
>
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> Cc: Vineet Gupta <vgupta@...opsys.com>

Applied to arc for-curr

Thx,
-Vineet

> ---
>   arch/arc/kernel/stacktrace.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arc/kernel/stacktrace.c b/arch/arc/kernel/stacktrace.c
> index 74315f302971..bf40e06f3fb8 100644
> --- a/arch/arc/kernel/stacktrace.c
> +++ b/arch/arc/kernel/stacktrace.c
> @@ -163,7 +163,7 @@ arc_unwind_core(struct task_struct *tsk, struct pt_regs *regs,
>    */
>   static int __print_sym(unsigned int address, void *unused)
>   {
> -	__print_symbol("  %s\n", address);
> +	printk("  %pS\n", (void *)address);
>   	return 0;
>   }
>