linux-kernel - Re: [PATCH] dumpstack: x86: various small unification steps

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Date:	Mon, 6 Oct 2008 11:35:29 +0200
From:	Louis Rilling <Louis.Rilling@...labs.com>
To:	Alexander van Heukelum <heukelum@...tmail.fm>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] dumpstack: x86: various small unification steps

On Sat, Oct 04, 2008 at 11:12:46PM +0200, Alexander van Heukelum wrote:
>  - define STACKSLOTS_PER_LINE and use it
>  - define get_bp macro to hide the %%ebp/%%rbp difference
>  - i386: check task==NULL in dump_trace, like x86_64
>  - i386: show_trace(NULL, ...) uses current automatically
>  - x86_64: use [#%d] for die_counter, like i386
>  - whitespace and comments
> 
[...]

> diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
> index 6ac80f0..ddc8a38 100644
> --- a/arch/x86/kernel/dumpstack_64.c
> +++ b/arch/x86/kernel/dumpstack_64.c
> @@ -16,8 +16,11 @@
>  
>  #include <asm/stacktrace.h>
>  
> +#define STACKSLOTS_PER_LINE 4
> +#define get_bp(bp) asm("movl %%rbp, %0" : "=r" (bp) :)
                           ^^^^
Should be movq.

Louis

>  int panic_on_unrecovered_nmi;
> -int kstack_depth_to_print = 12;
> +int kstack_depth_to_print = 3 * STACKSLOTS_PER_LINE;
>  static unsigned int code_bytes = 64;
>  static int die_counter;
>  
> @@ -177,7 +180,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
>  	if (!bp) {
>  		if (task == current) {
>  			/* Grab bp right from our regs */
> -			asm("movq %%rbp, %0" : "=r" (bp) : );
> +			get_bp(bp);
>  		} else {
>  			/* bp is the last reg pushed by switch_to */
>  			bp = *(unsigned long *) task->thread.sp;
> @@ -329,7 +332,7 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
>  		if (((long) stack & (THREAD_SIZE-1)) == 0)
>  			break;
>  		}
> -		if (i && ((i % 4) == 0))
> +		if (i && ((i % STACKSLOTS_PER_LINE) == 0))
>  			printk("\n%s", log_lvl);
>  		printk(" %016lx", *stack++);
>  		touch_nmi_watchdog();
> @@ -353,7 +356,7 @@ void dump_stack(void)
>  
>  #ifdef CONFIG_FRAME_POINTER
>  	if (!bp)
> -		asm("movq %%rbp, %0" : "=r" (bp) : );
> +		get_bp(bp);
>  #endif
>  
>  	printk("Pid: %d, comm: %.20s %s %s %.*s\n",
> @@ -396,7 +399,7 @@ void show_registers(struct pt_regs *regs)
>  
>  		ip = (u8 *)regs->ip - code_prologue;
>  		if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
> -			/* try starting at RIP */
> +			/* try starting at IP */
>  			ip = (u8 *)regs->ip;
>  			code_len = code_len - code_prologue + 1;
>  		}
> @@ -477,7 +480,7 @@ void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr)
>  
>  int __kprobes __die(const char *str, struct pt_regs *regs, long err)
>  {
> -	printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff, ++die_counter);
> +	printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
>  #ifdef CONFIG_PREEMPT
>  	printk("PREEMPT ");
>  #endif
> -- 
> 1.5.4.3
> 
> --
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-- 
Dr Louis Rilling			Kerlabs
Skype: louis.rilling			Batiment Germanium
Phone: (+33|0) 6 80 89 08 23		80 avenue des Buttes de Coesmes
http://www.kerlabs.com/			35700 Rennes

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