[017/143] khugepaged: remove unneeded return value of khugepaged_collapse_pte_mapped_thps()

Commit Message

Andrew Morton May 5, 2021, 1:33 a.m. UTC

From: Miaohe Lin <[e-mail]>
Subject: khugepaged: remove unneeded return value of khugepaged_collapse_pte_mapped_thps()

Patch series "Cleanup and fixup for khugepaged", v2.

This series contains cleanups to remove unneeded return value, use helper
function and so on.  And there is one fix to correct the wrong result
value for trace_mm_collapse_huge_page_isolate().


This patch (of 4):

The return value of khugepaged_collapse_pte_mapped_thps() is never checked
since it's introduced.  We should remove such unneeded return value.

Link: https://lkml.kernel.org/r/[e-mail]
Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Miaohe Lin <[e-mail]>
Acked-by: Kirill A. Shutemov <[e-mail]>
Cc: Rik van Riel <[e-mail]>
Cc: Ebru Akagunduz <[e-mail]>
Cc: Dan Carpenter <[e-mail]>
Cc: Mike Kravetz <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 mm/khugepaged.c |   10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

Patch

--- a/mm/khugepaged.c~khugepaged-remove-unneeded-return-value-of-khugepaged_collapse_pte_mapped_thps
+++ a/mm/khugepaged.c
@@ -1533,16 +1533,16 @@  abort:
 	goto drop_hpage;
 }
 
-static int khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot)
+static void khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot)
 {
 	struct mm_struct *mm = mm_slot->mm;
 	int i;
 
 	if (likely(mm_slot->nr_pte_mapped_thp == 0))
-		return 0;
+		return;
 
 	if (!mmap_write_trylock(mm))
-		return -EBUSY;
+		return;
 
 	if (unlikely(khugepaged_test_exit(mm)))
 		goto out;
@@ -1553,7 +1553,6 @@  static int khugepaged_collapse_pte_mappe
 out:
 	mm_slot->nr_pte_mapped_thp = 0;
 	mmap_write_unlock(mm);
-	return 0;
 }
 
 static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
@@ -2057,9 +2056,8 @@  static void khugepaged_scan_file(struct
 	BUILD_BUG();
 }
 
-static int khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot)
+static void khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot)
 {
-	return 0;
 }
 #endif