thp: khugepaged_prealloc_page() forgot to reset the page alloc indicator
If NUMA is enabled, the indicator is not reset if the previous page
request failed, ausing us to trigger the BUG_ON() in
khugepaged_alloc_page().
Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 7cf8b0e..7153e0d1 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1797,6 +1797,7 @@
return false;
*wait = false;
+ *hpage = NULL;
khugepaged_alloc_sleep();
} else if (*hpage) {
put_page(*hpage);