kernel/debug-bad-pte-dmi.patch

Occasionally we see reports of page table corruption, and it's not clear why.
By printing out the hardware name, we could potentially see some patterns.

Signed-off-by: Dave Jones <davej@redhat.com>

--- linux.orig/include/asm-generic/bug.h
+++ linux/include/asm-generic/bug.h
@@ -55,6 +55,8 @@ struct bug_entry {
 #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while(0)
 #endif
 
+void print_hardware_dmi_name(void);
+
 /*
  * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
  * significant issues that need prompt attention if they should ever
--- linux.orig/kernel/panic.c
+++ linux/kernel/panic.c
@@ -391,6 +391,15 @@ void oops_exit(void)
 	kmsg_dump(KMSG_DUMP_OOPS);
 }
 
+void print_hardware_dmi_name(void)
+{
+	const char *board;
+
+	board = dmi_get_system_info(DMI_PRODUCT_NAME);
+	if (board)
+		printk(KERN_WARNING "Hardware name: %s\n", board);
+}
+
 #ifdef WANT_WARN_ON_SLOWPATH
 struct slowpath_args {
 	const char *fmt;
@@ -400,13 +409,10 @@ struct slowpath_args {
 static void warn_slowpath_common(const char *file, int line, void *caller,
 				 unsigned taint, struct slowpath_args *args)
 {
-	const char *board;
-
 	printk(KERN_WARNING "------------[ cut here ]------------\n");
 	printk(KERN_WARNING "WARNING: at %s:%d %pS()\n", file, line, caller);
-	board = dmi_get_system_info(DMI_PRODUCT_NAME);
-	if (board)
-		printk(KERN_WARNING "Hardware name: %s\n", board);
+
+	print_hardware_dmi_name();
 
 	if (args)
 		vprintk(args->fmt, args->args);
--- linux.orig/mm/memory.c
+++ linux/mm/memory.c
@@ -706,6 +706,8 @@ static void print_bad_pte(struct vm_area
 		"BUG: Bad page map in process %s  pte:%08llx pmd:%08llx\n",
 		current->comm,
 		(long long)pte_val(pte), (long long)pmd_val(*pmd));
+	print_hardware_dmi_name();
+
 	if (page)
 		dump_page(page);
 	printk(KERN_ALERT
--- linux.orig/mm/page_alloc.c
+++ linux/mm/page_alloc.c
@@ -321,6 +321,7 @@ static void bad_page(struct page *page)
 		current->comm, page_to_pfn(page));
 	dump_page(page);
 
+	print_hardware_dmi_name();
 	print_modules();
 	dump_stack();
 out: