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authorWu Fengguang <fengguang.wu@intel.com>2009-12-16 12:19:59 +0100
committerAndi Kleen <ak@linux.intel.com>2009-12-16 12:19:59 +0100
commit478c5ffc0b50527bd2390f2daa46cc16276b8413 (patch)
treef58f5be9760fd0e81567611cf6e9f9bc77d1d3cd /mm/memory-failure.c
parent1a9b5b7fe0c5dad8a635288882d36785dea742f9 (diff)
downloadblackbird-op-linux-478c5ffc0b50527bd2390f2daa46cc16276b8413.tar.gz
blackbird-op-linux-478c5ffc0b50527bd2390f2daa46cc16276b8413.zip
HWPOISON: add page flags filter
When specified, only poison pages if ((page_flags & mask) == value). - corrupt-filter-flags-mask - corrupt-filter-flags-value This allows stress testing of many kinds of pages. Strictly speaking, the buddy pages requires taking zone lock, to avoid setting PG_hwpoison on a "was buddy but now allocated to someone" page. However we can just do nothing because we set PG_locked in the beginning, this prevents the page allocator from allocating it to someone. (It will BUG() on the unexpected PG_locked, which is fine for hwpoison testing.) [AK: Add select PROC_PAGE_MONITOR to satisfy dependency] CC: Nick Piggin <npiggin@suse.de> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'mm/memory-failure.c')
-rw-r--r--mm/memory-failure.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 82ac73436d0e..22d2b2028e54 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -34,6 +34,7 @@
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/page-flags.h>
+#include <linux/kernel-page-flags.h>
#include <linux/sched.h>
#include <linux/ksm.h>
#include <linux/rmap.h>
@@ -50,8 +51,12 @@ atomic_long_t mce_bad_pages __read_mostly = ATOMIC_LONG_INIT(0);
u32 hwpoison_filter_dev_major = ~0U;
u32 hwpoison_filter_dev_minor = ~0U;
+u64 hwpoison_filter_flags_mask;
+u64 hwpoison_filter_flags_value;
EXPORT_SYMBOL_GPL(hwpoison_filter_dev_major);
EXPORT_SYMBOL_GPL(hwpoison_filter_dev_minor);
+EXPORT_SYMBOL_GPL(hwpoison_filter_flags_mask);
+EXPORT_SYMBOL_GPL(hwpoison_filter_flags_value);
static int hwpoison_filter_dev(struct page *p)
{
@@ -83,11 +88,26 @@ static int hwpoison_filter_dev(struct page *p)
return 0;
}
+static int hwpoison_filter_flags(struct page *p)
+{
+ if (!hwpoison_filter_flags_mask)
+ return 0;
+
+ if ((stable_page_flags(p) & hwpoison_filter_flags_mask) ==
+ hwpoison_filter_flags_value)
+ return 0;
+ else
+ return -EINVAL;
+}
+
int hwpoison_filter(struct page *p)
{
if (hwpoison_filter_dev(p))
return -EINVAL;
+ if (hwpoison_filter_flags(p))
+ return -EINVAL;
+
return 0;
}
EXPORT_SYMBOL_GPL(hwpoison_filter);
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