[PATCH] Kdump: Export crash notes section address through sysfs
o Following patch exports kexec global variable "crash_notes" to user space
through sysfs as kernel attribute in /sys/kernel.
Signed-off-by: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index 1f064a6..015fb69 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -30,6 +30,16 @@
KERNEL_ATTR_RO(hotplug_seqnum);
#endif
+#ifdef CONFIG_KEXEC
+#include <asm/kexec.h>
+
+static ssize_t crash_notes_show(struct subsystem *subsys, char *page)
+{
+ return sprintf(page, "%p\n", (void *)crash_notes);
+}
+KERNEL_ATTR_RO(crash_notes);
+#endif
+
decl_subsys(kernel, NULL, NULL);
EXPORT_SYMBOL_GPL(kernel_subsys);
@@ -37,6 +47,9 @@
#ifdef CONFIG_HOTPLUG
&hotplug_seqnum_attr.attr,
#endif
+#ifdef CONFIG_KEXEC
+ &crash_notes_attr.attr,
+#endif
NULL
};