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authorTakashi Iwai <tiwai@suse.de>2008-12-19 08:22:57 +0100
committerTakashi Iwai <tiwai@suse.de>2008-12-19 08:22:57 +0100
commit0ff555192a8d20385d49d1c420e2e8d409b3c0da (patch)
treeb6e4b6cae1028a310a3488ebf745954c51694bfc /include/linux/crash_dump.h
parent3218c178b41b420cb7e0d120c7a137a3969242e5 (diff)
parent9e43f0de690211cf7153b5f3ec251bc315647ada (diff)
Merge branch 'fix/hda' into topic/hda
Diffstat (limited to 'include/linux/crash_dump.h')
-rw-r--r--include/linux/crash_dump.h40
1 files changed, 34 insertions, 6 deletions
diff --git a/include/linux/crash_dump.h b/include/linux/crash_dump.h
index 025e4f57510..2dac064d835 100644
--- a/include/linux/crash_dump.h
+++ b/include/linux/crash_dump.h
@@ -8,17 +8,12 @@
#include <linux/proc_fs.h>
#define ELFCORE_ADDR_MAX (-1ULL)
+#define ELFCORE_ADDR_ERR (-2ULL)
-#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;
-extern struct proc_dir_entry *proc_vmcore;
/* Architecture code defines this if there are other possible ELF
* machine types, e.g. on bi-arch capable hardware. */
@@ -28,10 +23,43 @@ 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;
}
+
+/* is_vmcore_usable() checks if the kernel is booting after a panic and
+ * the vmcore region is usable.
+ *
+ * This makes use of the fact that due to alignment -2ULL is not
+ * a valid pointer, much in the vain of IS_ERR(), except
+ * dealing directly with an unsigned long long rather than a pointer.
+ */
+
+static inline int is_vmcore_usable(void)
+{
+ return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0;
+}
+
+/* vmcore_unusable() marks the vmcore as unusable,
+ * without disturbing the logic of is_kdump_kernel()
+ */
+
+static inline void vmcore_unusable(void)
+{
+ if (is_kdump_kernel())
+ elfcorehdr_addr = ELFCORE_ADDR_ERR;
+}
#else /* !CONFIG_CRASH_DUMP */
static inline int is_kdump_kernel(void) { return 0; }
#endif /* CONFIG_CRASH_DUMP */