linux-kernel - [PATCH v2 1/4] khugepaged: remove unneeded return value of khugepaged_collapse_pte_mapped

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Date:   Fri, 5 Mar 2021 22:29:44 -0500
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <kirill.shutemov@...ux.intel.com>
CC:     <riel@...hat.com>, <ebru.akagunduz@...il.com>,
        <dan.carpenter@...cle.com>, <linux-kernel@...r.kernel.org>,
        <linux-mm@...ck.org>, <linmiaohe@...wei.com>
Subject: [PATCH v2 1/4] khugepaged: remove unneeded return value of khugepaged_collapse_pte_mapped_thps()

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

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 mm/khugepaged.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index a7d6cb912b05..d43812c5ce16 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1533,16 +1533,16 @@ void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr)
 	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_mapped_thps(struct mm_slot *mm_slot)
 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 mm_struct *mm,
 	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
 
-- 
2.19.1