[PATCH 2/2] pseries: phyp dump: inform kdump, phyp-dump is loaded.

[PATCH 2/2] pseries: phyp dump: inform kdump, phyp-dump is loaded.

[Manish Ahuja]

Patch 2:

Addition of /sys/kernel/phyp_dump_active so that kdump init scripts may 
look for it and take appropriate action if this file is found. This
file is only loaded when phyp_dump has been registered.

Signed-off-by: Manish Ahuja <mahuja@us.ibm.com>

---
 arch/powerpc/platforms/pseries/phyp_dump.c |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

Index: 2.6.25-rc1/arch/powerpc/platforms/pseries/phyp_dump.c
===================================================================
--- 2.6.25-rc1.orig/arch/powerpc/platforms/pseries/phyp_dump.c	2008-03-22 01:07:43.000000000 -0500
+++ 2.6.25-rc1/arch/powerpc/platforms/pseries/phyp_dump.c	2008-03-22 01:08:56.000000000 -0500
@@ -182,6 +182,18 @@ static void print_dump_header(const stru
 #endif
 }
 
+static ssize_t show_phyp_dump_active(struct kobject *kobj,
+			struct kobj_attribute *attr, char *buf)
+{
+
+	/* create filesystem entry so kdump is phyp-dump aware */
+	return sprintf(buf, "%lx\n", phyp_dump_info->phyp_dump_at_boot);
+}
+
+static struct kobj_attribute pdl = __ATTR(phyp_dump_active, 0600,
+					show_phyp_dump_active,
+					NULL);
+
 static void register_dump_area(struct phyp_dump_header *ph, unsigned long addr)
 {
 	int rc;
@@ -204,7 +216,13 @@ static void register_dump_area(struct ph
 		printk(KERN_ERR "phyp-dump: unexpected error (%d) on "
 						"register\n", rc);
 		print_dump_header(ph);
+		return;
 	}
+
+	rc = sysfs_create_file(kernel_kobj, &pdl.attr);
+	if (rc)
+		printk(KERN_ERR "phyp-dump: unable to create sysfs"
+				" file (%d)\n", rc);
 }
 
 static