From: Nick Piggin <nickpiggin@yahoo.com.au>

Hugh and I both thought this would be generally useful.

Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 25-akpm/include/linux/kernel.h |    1 +
 25-akpm/kernel/panic.c         |    6 ++++--
 25-akpm/mm/page_alloc.c        |    1 +
 3 files changed, 6 insertions(+), 2 deletions(-)

diff -puN include/linux/kernel.h~taint-on-bad_page include/linux/kernel.h
--- 25/include/linux/kernel.h~taint-on-bad_page	2004-09-30 22:37:12.108909384 -0700
+++ 25-akpm/include/linux/kernel.h	2004-09-30 22:37:12.115908320 -0700
@@ -151,6 +151,7 @@ extern enum system_states {
 #define TAINT_UNSAFE_SMP		(1<<2)
 #define TAINT_FORCED_RMMOD		(1<<3)
 #define TAINT_MACHINE_CHECK		(1<<4)
+#define TAINT_BAD_PAGE			(1<<5)
 
 extern void dump_stack(void);
 
diff -puN kernel/panic.c~taint-on-bad_page kernel/panic.c
--- 25/kernel/panic.c~taint-on-bad_page	2004-09-30 22:37:12.109909232 -0700
+++ 25-akpm/kernel/panic.c	2004-09-30 22:37:12.115908320 -0700
@@ -119,6 +119,7 @@ EXPORT_SYMBOL(panic);
  *  'S' - SMP with CPUs not designed for SMP.
  *  'R' - User forced a module unload.
  *  'M' - Machine had a machine check experience.
+ *  'B' - System has hit bad_page.
  *
  *	The string is overwritten by the next call to print_taint().
  */
@@ -127,12 +128,13 @@ const char *print_tainted(void)
 {
 	static char buf[20];
 	if (tainted) {
-		snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c",
+		snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c",
 			tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
 			tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
 			tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
 			tainted & TAINT_FORCED_RMMOD ? 'R' : ' ',
- 			tainted & TAINT_MACHINE_CHECK ? 'M' : ' ');
+ 			tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
+			tainted & TAINT_BAD_PAGE ? 'B' : ' ');
 	}
 	else
 		snprintf(buf, sizeof(buf), "Not tainted");
diff -puN mm/page_alloc.c~taint-on-bad_page mm/page_alloc.c
--- 25/mm/page_alloc.c~taint-on-bad_page	2004-09-30 22:37:12.111908928 -0700
+++ 25-akpm/mm/page_alloc.c	2004-09-30 22:37:12.117908016 -0700
@@ -95,6 +95,7 @@ static void bad_page(const char *functio
 	set_page_count(page, 0);
 	reset_page_mapcount(page);
 	page->mapping = NULL;
+	tainted |= TAINT_BAD_PAGE;
 }
 
 #ifndef CONFIG_HUGETLB_PAGE
_