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

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Date:	Mon, 28 Jul 2008 17:13:14 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Simon Horman <horms@...ge.net.au>
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: [PATCH 3/5] ia64: Define elfcorehdr_addr in arch dependent section


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;
_
--
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