[PATCH v3 6/9] memory-hotplug: update mce_bad_pages when removing the memory

[wency]

From: Wen Congyang <wency@xxxxxxxxxxxxxx>

When we hotremove a memory device, we will free the memory to store
struct page. If the page is hwpoisoned page, we should decrease
mce_bad_pages.

CC: David Rientjes <rientjes@xxxxxxxxxx>
CC: Jiang Liu <liuj97@xxxxxxxxx>
CC: Len Brown <len.brown@xxxxxxxxx>
CC: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
CC: Paul Mackerras <paulus@xxxxxxxxx>
CC: Christoph Lameter <cl@xxxxxxxxx>
Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
CC: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
CC: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
---
 mm/sparse.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index 0021265..77d6a93 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -774,6 +774,24 @@ out:
 	return ret;
 }
 
+#ifdef CONFIG_MEMORY_FAILURE
+static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
+{
+	int i;
+
+	for (i = 0; i < PAGES_PER_SECTION; i++) {
+		if (PageHWPoison(&memmap[i])) {
+			atomic_long_sub(1, &mce_bad_pages);
+			ClearPageHWPoison(&memmap[i]);
+		}
+	}
+}
+#else
+static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
+{
+}
+#endif
+
 void sparse_remove_one_section(struct zone *zone, struct mem_section *ms)
 {
 	struct page *memmap = NULL;
@@ -785,6 +803,7 @@ void sparse_remove_one_section(struct zone *zone, struct mem_section *ms)
 						__section_nr(ms));
 		ms->section_mem_map = 0;
 		ms->pageblock_flags = NULL;
+		clear_hwpoisoned_pages(memmap, PAGES_PER_SECTION);
 	}
 
 	free_section_usemap(memmap, usemap);
-- 
1.7.1

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