linux-kernel - [PATCH 4/5] powerpc: Define elfcorehdr

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Message-ID: <20080728211408.GD9985@redhat.com>
Date:	Mon, 28 Jul 2008 17:14:08 -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 4/5] powerpc: 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/powerpc/kernel/crash_dump.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff -puN arch/powerpc/kernel/crash_dump.c~fix-elfcorehdr_addr-parsing-ppc64 arch/powerpc/kernel/crash_dump.c
--- linux-2.6.27-pre-rc1/arch/powerpc/kernel/crash_dump.c~fix-elfcorehdr_addr-parsing-ppc64	2008-07-28 12:14:22.000000000 -0400
+++ linux-2.6.27-pre-rc1-root/arch/powerpc/kernel/crash_dump.c	2008-07-28 12:14:22.000000000 -0400
@@ -27,6 +27,9 @@
 #define DBG(fmt...)
 #endif
 
+/* Stores the physical address of elf header of crash image. */
+unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
+
 void __init reserve_kdump_trampoline(void)
 {
 	lmb_reserve(0, KDUMP_RESERVE_LIMIT);
@@ -66,7 +69,11 @@ void __init setup_kdump_trampoline(void)
 	DBG(" <- setup_kdump_trampoline()\n");
 }
 
-#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.
+ */
 static int __init parse_elfcorehdr(char *p)
 {
 	if (p)
@@ -75,7 +82,6 @@ static int __init parse_elfcorehdr(char 
 	return 1;
 }
 __setup("elfcorehdr=", parse_elfcorehdr);
-#endif
 
 static int __init parse_savemaxmem(char *p)
 {
_
--
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