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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