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mm, hwpoison: avoid trying to unpoison reserved page

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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.

Link: https://lkml.kernel.org/r/20220818130016.45313-7-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2022-08-18 21:00:16 +08:00 committed by Andrew Morton
parent 0792a4a619
commit e9ff3ba7ff
1 changed files with 2 additions and 2 deletions
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4
mm/memory-failure.c
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@ -2351,7 +2351,7 @@ 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);
@ -2382,7 +2382,7 @@ 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;
}