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Subject[PATCH] rmap 30 fix bad mapcount
From: Andrea Arcangeli <andrea@suse.de>

page_alloc.c's bad_page routine should reset a bad mapcount; and it's
more revealing to show the bad mapcount than just the boolean mapped.

page_alloc.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
--- rmap29/mm/page_alloc.c 2004-05-05 13:29:08.000000000 +0100
+++ rmap30/mm/page_alloc.c 2004-05-08 20:55:38.593511352 +0100
@@ -73,9 +73,9 @@ static void bad_page(const char *functio
{
printk(KERN_EMERG "Bad page state at %s (in process '%s', page %p)\n",
function, current->comm, page);
- printk(KERN_EMERG "flags:0x%08lx mapping:%p mapped:%d count:%d\n",
+ printk(KERN_EMERG "flags:0x%08lx mapping:%p mapcount:%d count:%d\n",
(unsigned long)page->flags, page->mapping,
- page_mapped(page), page_count(page));
+ (int)page->mapcount, page_count(page));
printk(KERN_EMERG "Backtrace:\n");
dump_stack();
printk(KERN_EMERG "Trying to fix it up, but a reboot is needed\n");
@@ -90,6 +90,7 @@ static void bad_page(const char *functio
1 << PG_writeback);
set_page_count(page, 0);
page->mapping = NULL;
+ page->mapcount = 0;
}

#ifndef CONFIG_HUGETLB_PAGE
-
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