[PATCH] crashdump: fix undefined reference to `elfcorehdr_addr'

[Ingo Molnar]

fix build bug introduced by 95b68dec0d5 "calgary iommu: use the first
kernels TCE tables in kdump":

 arch/x86/kernel/built-in.o: In function `calgary_iommu_init':
 (.init.text+0x8399): undefined reference to `elfcorehdr_addr'
 arch/x86/kernel/built-in.o: In function `calgary_iommu_init':
 (.init.text+0x856c): undefined reference to `elfcorehdr_addr'
 arch/x86/kernel/built-in.o: In function `detect_calgary':
 (.init.text+0x8c68): undefined reference to `elfcorehdr_addr'
 arch/x86/kernel/built-in.o: In function `detect_calgary':
 (.init.text+0x8d0c): undefined reference to `elfcorehdr_addr'

make elfcorehdr_addr a generally available symbol.

Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
 include/linux/crash_dump.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/include/linux/crash_dump.h b/include/linux/crash_dump.h
index 6cd39a9..025e4f5 100644
--- a/include/linux/crash_dump.h
+++ b/include/linux/crash_dump.h
@@ -8,7 +8,13 @@
 #include <linux/proc_fs.h>
 
 #define ELFCORE_ADDR_MAX	(-1ULL)
+
+#ifdef CONFIG_PROC_VMCORE
 extern unsigned long long elfcorehdr_addr;
+#else
+static const unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
+#endif
+
 extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,
 						unsigned long, int);
 extern const struct file_operations proc_vmcore_operations;
--
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