[PATCH] mm/khugepaged: Add missed tracepoint for collapse_huge_page_swapin

[SeongJae Park]

One return case of `__collapse_huge_page_swapin()` does not invoke
tracepoint while every other return case does.  This commit adds a
tracepoint invocation for the case.

Signed-off-by: SeongJae Park <sj38.p...@gmail.com>
---
 mm/khugepaged.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index ba40b7f673f4..9aad377c67a8 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -909,8 +909,10 @@ static bool __collapse_huge_page_swapin(struct mm_struct 
*mm,
                                return false;
                        }
                        /* check if the pmd is still valid */
-                       if (mm_find_pmd(mm, address) != pmd)
+                       if (mm_find_pmd(mm, address) != pmd) {
+                               trace_mm_collapse_huge_page_swapin(mm, 
swapped_in, referenced, 0);
                                return false;
+                       }
                }
                if (ret & VM_FAULT_ERROR) {
                        trace_mm_collapse_huge_page_swapin(mm, swapped_in, 
referenced, 0);
-- 
2.12.0