kdump: make elfcorehdr_addr independent of CONFIG_PROC_VMCORE

[pandora-kernel.git] / include / linux / crash_dump.h

diff --git a/include/linux/crash_dump.h b/include/linux/crash_dump.h
index 22c7ac5..de027d1 100644 (file)
--- a/include/linux/crash_dump.h
+++ b/include/linux/crash_dump.h
@@ -8,7 +8,9 @@
 #include <linux/proc_fs.h>
 
 #define ELFCORE_ADDR_MAX       (-1ULL)
+
 extern unsigned long long elfcorehdr_addr;
+
 extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,
                                                unsigned long, int);
 extern const struct file_operations proc_vmcore_operations;
@@ -22,5 +24,23 @@ extern struct proc_dir_entry *proc_vmcore;
 
 #define vmcore_elf_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
 
+/*
+ * is_kdump_kernel() checks whether this kernel is booting after a panic of
+ * previous kernel or not. This is determined by checking if previous kernel
+ * has passed the elf core header address on command line.
+ *
+ * This is not just a test if CONFIG_CRASH_DUMP is enabled or not. It will
+ * return 1 if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic of
+ * previous kernel.
+ */
+
+static inline int is_kdump_kernel(void)
+{
+       return (elfcorehdr_addr != ELFCORE_ADDR_MAX) ? 1 : 0;
+}
+#else /* !CONFIG_CRASH_DUMP */
+static inline int is_kdump_kernel(void) { return 0; }
 #endif /* CONFIG_CRASH_DUMP */
+
+extern unsigned long saved_max_pfn;
 #endif /* LINUX_CRASHDUMP_H */