linux-kernel - Re: [RFC Patch 4/6] PANIC_MCE: Introduce a new panic flag for fatal MCE, capture related information

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Date:	Thu, 26 May 2011 14:43:50 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	"K.Prasad" <prasad@...ux.vnet.ibm.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	"Luck, Tony" <tony.luck@...el.com>, kexec@...ts.infradead.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>, anderson@...hat.com
Subject: Re: [RFC Patch 4/6] PANIC_MCE: Introduce a new panic flag for fatal
 MCE, capture related information

On Thu, May 26, 2011 at 10:45:21PM +0530, K.Prasad wrote:

[..]
> Index: linux-2.6.slim_kdump/arch/x86/kernel/cpu/mcheck/mce.c
> ===================================================================
> --- linux-2.6.slim_kdump.orig/arch/x86/kernel/cpu/mcheck/mce.c
> +++ linux-2.6.slim_kdump/arch/x86/kernel/cpu/mcheck/mce.c
> @@ -258,8 +258,7 @@ static void wait_for_panic(void)
>  	local_irq_enable();
>  	while (timeout-- > 0)
>  		udelay(1);
> -	xpanic(PANIC_NO_KEXEC|PANIC_NO_BACKTRACE, 0,
> -		"Panicing machine check CPU died");
> +	xpanic(PANIC_MCE, 0, NULL, 0, "Panicing machine check CPU died");
>  }
>  
>  static void mce_panic(char *msg, struct mce *final, char *exp)
> @@ -315,8 +314,8 @@ static void mce_panic(char *msg, struct
>  	if (exp)
>  		pr_emerg(HW_ERR "Machine check: %s\n", exp);
>  	if (!fake_panic) {
> -		xpanic(PANIC_NO_KEXEC|PANIC_NO_BACKTRACE, mce_panic_timeout,
> -			msg);
> +		xpanic(PANIC_MCE, mce_panic_timeout, final,
> +			sizeof(struct mce), msg);
>  	} else
>  		pr_emerg(HW_ERR "Fake kernel panic: %s\n", msg);
>  }

In previous patches you introduce PANIC_NO_KEXEC and PANIC_NO_BACKTRACE. 
Now in this patch you got rid of those. Are there any other users left
of PANIC_NO_BACKTRACE and PANIC_NO_EXEC? If not, then why to introduce
these to begin with.

Thanks
Vivek
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