This patch enables hwpoison injection through debug/hwpoison interfaces,
with which we can test memory error handling for free or reserved
hugepages (which cannot be tested by madvise() injector).
Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
mm/hwpoison-inject.c | 15 +++++++++------
1 files changed, 9 insertions(+), 6 deletions(-)
diff --git v2.6.34/mm/hwpoison-inject.c v2.6.34/mm/hwpoison-inject.c
index 10ea719..0948f10 100644
--- v2.6.34/mm/hwpoison-inject.c
+++ v2.6.34/mm/hwpoison-inject.c
@@ -5,6 +5,7 @@
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/pagemap.h>
+#include <linux/hugetlb.h>
#include "internal.h"
static struct dentry *hwpoison_dir;
@@ -13,6 +14,7 @@ static int hwpoison_inject(void *data, u64 val)
{
unsigned long pfn = val;
struct page *p;
+ struct page *hpage;
int err;
if (!capable(CAP_SYS_ADMIN))
@@ -24,18 +26,19 @@ static int hwpoison_inject(void *data, u64 val)
return -ENXIO;
p = pfn_to_page(pfn);
+ hpage = compound_head(p);
/*
* This implies unable to support free buddy pages.
*/
- if (!get_page_unless_zero(p))
+ if (!get_page_unless_zero(hpage))
return 0;
- if (!PageLRU(p))
+ if (!PageLRU(p) && !PageHuge(p))
shake_page(p, 0);
/*
* This implies unable to support non-LRU pages.
*/
- if (!PageLRU(p))
+ if (!PageLRU(p) && !PageHuge(p))
return 0;
/*
@@ -44,9 +47,9 @@ static int hwpoison_inject(void *data, u64 val)
* We temporarily take page lock for try_get_mem_cgroup_from_page().
* __memory_failure() will redo the check reliably inside page lock.
*/
- lock_page(p);
- err = hwpoison_filter(p);
- unlock_page(p);
+ lock_page(hpage);
+ err = hwpoison_filter(hpage);
+ unlock_page(hpage);
if (err)
return 0;
--
1.7.0
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