korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-12-18 08:35:08 +08:00
Code Issues Packages Projects Releases Wiki Activity

mm/hwpoison: retry with shake_page() for unhandlable pages

Browse Source 
HWPoisonHandlable() sometimes returns false for typical user pages due
to races with average memory events like transfers over LRU lists.  This
causes failures in hwpoison handling.

There's retry code for such a case but does not work because the retry
loop reaches the retry limit too quickly before the page settles down to
handlable state.  Let get_any_page() call shake_page() to fix it.

[naoya.horiguchi@nec.com: get_any_page(): return -EIO when retry limit reached]
  Link: https://lkml.kernel.org/r/20210819001958.2365157-1-naoya.horiguchi@linux.dev

Link: https://lkml.kernel.org/r/20210817053703.2267588-1-naoya.horiguchi@linux.dev
Fixes: 25182f05ff ("mm,hwpoison: fix race with hugetlb page allocation")
Signed-off-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Reported-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: <stable@vger.kernel.org>		[5.13+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Naoya Horiguchi 2021-08-19 19:04:24 -07:00 committed by Linus Torvalds
parent f56ce412a5
commit fcc00621d8
1 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
mm/memory-failure.c
View File

@ -1146,7 +1146,7 @@ static int __get_hwpoison_page(struct page *page)
* unexpected races caused by taking a page refcount.
*/
if (!HWPoisonHandlable(head))
return 0;
return -EBUSY;
if (PageTransHuge(head)) {
/*
@ -1199,9 +1199,15 @@ try_again:
}
goto out;
} else if (ret == -EBUSY) {
/* We raced with freeing huge page to buddy, retry. */
if (pass++ < 3)
/*
* We raced with (possibly temporary) unhandlable
* page, retry.
*/
if (pass++ < 3) {
shake_page(p, 1);
goto try_again;
}
ret = -EIO;
goto out;
}
}