For reserved pages, HWPoison flag will be set without increasing the page
refcnt. So we shouldn't even try to unpoison these pages and thus decrease
the page refcnt unexpectly. Add a PageReserved() check to filter this case
out and remove the below unneeded zero page (zero page is reserved) check.
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
---
mm/memory-failure.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 5f9615a86296..c831c41bb092 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2355,7 +2355,7 @@ int unpoison_memory(unsigned long pfn)
goto unlock_mutex;
}
- if (PageSlab(page) || PageTable(page))
+ if (PageSlab(page) || PageTable(page) || PageReserved(page))
goto unlock_mutex;
ret = get_hwpoison_page(p, MF_UNPOISON);
@@ -2386,7 +2386,7 @@ int unpoison_memory(unsigned long pfn)
freeit = !!TestClearPageHWPoison(p);
put_page(page);
- if (freeit && !(pfn == my_zero_pfn(0) && page_count(p) == 1)) {
+ if (freeit) {
put_page(page);
ret = 0;
}
--
2.23.0
