From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Michal Hocko <mhocko@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Kravetz <mike.kravetz@oracle.com>,
xishi.qiuxishi@alibaba-inc.com,
Laurent Dufour <ldufour@linux.vnet.ibm.com>
Subject: [RFC][PATCH v1 05/11] mm: hwpoison-inject: don't pin for hwpoison_filter()
Date: Fri, 9 Nov 2018 15:47:09 +0900 [thread overview]
Message-ID: <1541746035-13408-6-git-send-email-n-horiguchi@ah.jp.nec.com> (raw)
In-Reply-To: <1541746035-13408-1-git-send-email-n-horiguchi@ah.jp.nec.com>
Another memory error injection interface debugfs:hwpoison/corrupt-pfn
also takes bogus refcount for hwpoison_filter(). It's justified
because this does a coarse filter, expecting that memory_failure()
redoes the check for sure.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
---
mm/hwpoison-inject.c | 18 +++++-------------
1 file changed, 5 insertions(+), 13 deletions(-)
diff --git v4.19-mmotm-2018-10-30-16-08/mm/hwpoison-inject.c v4.19-mmotm-2018-10-30-16-08_patched/mm/hwpoison-inject.c
index b6ac706..766062c 100644
--- v4.19-mmotm-2018-10-30-16-08/mm/hwpoison-inject.c
+++ v4.19-mmotm-2018-10-30-16-08_patched/mm/hwpoison-inject.c
@@ -25,11 +25,6 @@ static int hwpoison_inject(void *data, u64 val)
p = pfn_to_page(pfn);
hpage = compound_head(p);
- /*
- * This implies unable to support free buddy pages.
- */
- if (!get_hwpoison_page(p))
- return 0;
if (!hwpoison_filter_enable)
goto inject;
@@ -39,23 +34,20 @@ static int hwpoison_inject(void *data, u64 val)
* This implies unable to support non-LRU pages.
*/
if (!PageLRU(hpage) && !PageHuge(p))
- goto put_out;
+ return 0;
/*
- * do a racy check with elevated page count, to make sure PG_hwpoison
- * will only be set for the targeted owner (or on a free page).
+ * do a racy check to make sure PG_hwpoison will only be set for
+ * the targeted owner (or on a free page).
* memory_failure() will redo the check reliably inside page lock.
*/
err = hwpoison_filter(hpage);
if (err)
- goto put_out;
+ return 0;
inject:
pr_info("Injecting memory failure at pfn %#lx\n", pfn);
- return memory_failure(pfn, MF_COUNT_INCREASED);
-put_out:
- put_hwpoison_page(p);
- return 0;
+ return memory_failure(pfn, 0);
}
static int hwpoison_unpoison(void *data, u64 val)
--
2.7.0
next prev parent reply other threads:[~2018-11-09 6:47 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-09 6:47 [PATCH RFC v1 00/11] hwpoison improvement part 1 Naoya Horiguchi
2018-11-09 6:47 ` [RFC][PATCH v1 01/11] mm: hwpoison: cleanup unused PageHuge() check Naoya Horiguchi
2018-11-09 9:52 ` Anshuman Khandual
2018-11-09 6:47 ` [RFC][PATCH v1 02/11] mm: soft-offline: add missing error check of set_hwpoison_free_buddy_page() Naoya Horiguchi
2018-11-09 10:20 ` Anshuman Khandual
2018-11-13 0:16 ` Naoya Horiguchi
2018-11-14 8:53 ` Anshuman Khandual
2018-11-09 6:47 ` [RFC][PATCH v1 03/11] mm: move definition of num_poisoned_pages_inc/dec to include/linux/mm.h Naoya Horiguchi
2018-11-09 10:28 ` Anshuman Khandual
2018-11-13 0:17 ` Naoya Horiguchi
2018-11-09 6:47 ` [RFC][PATCH v1 04/11] mm: madvise: call soft_offline_page() without MF_COUNT_INCREASED Naoya Horiguchi
2018-11-09 10:46 ` Anshuman Khandual
2018-11-13 0:18 ` Naoya Horiguchi
2018-11-09 6:47 ` Naoya Horiguchi [this message]
2018-11-09 6:47 ` [RFC][PATCH v1 06/11] mm: hwpoison: remove MF_COUNT_INCREASED Naoya Horiguchi
2018-11-09 6:47 ` [RFC][PATCH v1 07/11] mm: remove flag argument from soft offline functions Naoya Horiguchi
2018-11-09 6:47 ` [RFC][PATCH v1 08/11] mm: soft-offline: isolate error pages from buddy freelist Naoya Horiguchi
2018-11-09 6:47 ` [RFC][PATCH v1 09/11] mm: hwpoison: apply buddy page handling code to hard-offline Naoya Horiguchi
2018-11-09 6:47 ` [RFC][PATCH v1 10/11] mm: clear PageHWPoison in memory hotremove Naoya Horiguchi
2018-11-13 1:32 ` Naoya Horiguchi
2018-11-09 6:47 ` [RFC][PATCH v1 11/11] mm: hwpoison: introduce clear_hwpoison_free_buddy_page() Naoya Horiguchi
2018-11-09 11:33 ` Anshuman Khandual
2018-11-13 0:19 ` Naoya Horiguchi
2018-11-14 8:23 ` Anshuman Khandual
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