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
_