iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mm, hwpoison: avoid trying to unpoison reserved page

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
mm/memory-failure.c
View File

@ -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;
}