The page cannot become compound pages again just after folio is splited
as extra refcnt is held. So MF_MSG_DIFFERENT_COMPOUND case is obsolete and
could be removed to get rid of this false assumption and code burden. But
add one WARN_ON() here to keep the scene clear.
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
---
include/ras/ras_event.h | 1 -
mm/memory-failure.c | 19 +++----------------
2 files changed, 3 insertions(+), 17 deletions(-)
diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h
index 9bc707fe8819..e5f7ee0864e7 100644
--- a/include/ras/ras_event.h
+++ b/include/ras/ras_event.h
@@ -356,7 +356,6 @@ TRACE_EVENT(aer_event,
#define MF_PAGE_TYPE \
EM ( MF_MSG_KERNEL, "reserved kernel page" ) \
EM ( MF_MSG_KERNEL_HIGH_ORDER, "high-order kernel page" ) \
- EM ( MF_MSG_DIFFERENT_COMPOUND, "different compound page after locking" ) \
EM ( MF_MSG_HUGE, "huge page" ) \
EM ( MF_MSG_FREE_HUGE, "free huge page" ) \
EM ( MF_MSG_GET_HWPOISON, "get hwpoison page" ) \
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 16f8651436d5..581d3e5c9117 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -919,7 +919,6 @@ static const char *action_name[] = {
static const char * const action_page_types[] = {
[MF_MSG_KERNEL] = "reserved kernel page",
[MF_MSG_KERNEL_HIGH_ORDER] = "high-order kernel page",
- [MF_MSG_DIFFERENT_COMPOUND] = "different compound page after locking",
[MF_MSG_HUGE] = "huge page",
[MF_MSG_FREE_HUGE] = "free huge page",
[MF_MSG_GET_HWPOISON] = "get hwpoison page",
@@ -2349,22 +2348,10 @@ int memory_failure(unsigned long pfn, int flags)
/*
* We're only intended to deal with the non-Compound page here.
- * However, the page could have changed compound pages due to
- * race window. If this happens, we could try again to hopefully
- * handle the page next round.
+ * The page cannot become compound pages again as folio has been
+ * splited and extra refcnt is held.
*/
- if (folio_test_large(folio)) {
- if (retry) {
- ClearPageHWPoison(p);
- folio_unlock(folio);
- folio_put(folio);
- flags &= ~MF_COUNT_INCREASED;
- retry = false;
- goto try_again;
- }
- res = action_result(pfn, MF_MSG_DIFFERENT_COMPOUND, MF_IGNORED);
- goto unlock_page;
- }
+ WARN_ON(folio_test_large(folio));
/*
* We use page flags to determine what action should be taken, but
--
2.33.0
