linux-kernel - Re: [PATCH 3/5] ia64: Define elfcorehdr

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Date:	Tue, 29 Jul 2008 14:42:43 +1000
From:	Simon Horman <horms@...ge.net.au>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Muli Ben-Yehuda <muli@...ibm.com>,
	Tony Luck <tony.luck@...el.com>, linux-ia64@...r.kernel.org,
	Chandru <chandru@...ibm.com>, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Terry Loftin <terry.loftin@...com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...abs.org
Subject: Re: [PATCH 3/5] ia64: Define elfcorehdr_addr in arch dependent
	section

On Mon, Jul 28, 2008 at 05:13:14PM -0400, Vivek Goyal wrote:
> 
> o Move elfcorehdr_addr definition in arch dependent crash dump file. This is
>   equivalent to defining elfcorehdr_addr under CONFIG_CRASH_DUMP instead of
>   CONFIG_PROC_VMCORE. This is needed by is_kdump_kernel() which can be
>   used irrespective of the fact whether CONFIG_PROC_VMCORE is enabled or
>   not.
> 
> Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
> ---
> 
>  arch/ia64/kernel/setup.c |    9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff -puN arch/ia64/kernel/setup.c~fix-elfcorehdr_addr-parsing-ia64 arch/ia64/kernel/setup.c
> --- linux-2.6.27-pre-rc1/arch/ia64/kernel/setup.c~fix-elfcorehdr_addr-parsing-ia64	2008-07-28 12:16:40.000000000 -0400
> +++ linux-2.6.27-pre-rc1-root/arch/ia64/kernel/setup.c	2008-07-28 12:16:40.000000000 -0400
> @@ -478,7 +478,12 @@ static __init int setup_nomca(char *s)
>  }
>  early_param("nomca", setup_nomca);
>  
> -#ifdef CONFIG_PROC_VMCORE
> +/*
> + * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
> + * is_kdump_kernel() to determine if we are booting after a panic. Hence
> + * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
> + */
> +#ifdef CONFIG_CRASH_DUMP
>  /* elfcorehdr= specifies the location of elf core header
>   * stored by the crashed kernel.
>   */
> @@ -491,7 +496,9 @@ static int __init parse_elfcorehdr(char 
>  	return 0;
>  }
>  early_param("elfcorehdr", parse_elfcorehdr);
> +#endif
>  
> +#ifdef CONFIG_PROC_VMCORE
>  int __init reserve_elfcorehdr(unsigned long *start, unsigned long *end)
>  {
>  	unsigned long length;
> _

Hi Vivek,

I think that you also need the following in arch/ia64/kernel/crash_dump.c.
With this change your code compiles on ia64.

Signed-off-by: Simon Horman <horms@...ge.net.au>


Index: linux-2.6/arch/ia64/kernel/crash_dump.c
===================================================================
--- linux-2.6.orig/arch/ia64/kernel/crash_dump.c	2008-07-29 14:06:57.000000000 +1000
+++ linux-2.6/arch/ia64/kernel/crash_dump.c	2008-07-29 14:09:55.000000000 +1000
@@ -8,10 +8,14 @@
 
 #include <linux/errno.h>
 #include <linux/types.h>
+#include <linux/crash_dump.h>
 
 #include <asm/page.h>
 #include <asm/uaccess.h>
 
+/* Stores the physical address of elf header of crash image. */
+unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
+
 /**
  * copy_oldmem_page - copy one page from "oldmem"
  * @pfn: page frame number to be copied

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