linux-kernel - [PATCH] mm/ksm: One function call less in __ksm

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Message-ID: <997c8ec3-9af8-3db0-24dc-cd99fe3efe14@web.de>
Date:   Fri, 5 Jul 2019 16:16:30 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Dave Jiang <dave.jiang@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Souptick Joarder <jrdr.linux@...il.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] mm/ksm: One function call less in __ksm_enter()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Fri, 5 Jul 2019 16:02:26 +0200

Avoid an extra function call by using a ternary operator instead of
a conditional statement.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 mm/ksm.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/ksm.c b/mm/ksm.c
index 3dc4346411e4..7934bab8ceae 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -2521,10 +2521,10 @@ int __ksm_enter(struct mm_struct *mm)
 	 * scanning cursor, otherwise KSM pages in newly forked mms will be
 	 * missed: then we might as well insert at the end of the list.
 	 */
-	if (ksm_run & KSM_RUN_UNMERGE)
-		list_add_tail(&mm_slot->mm_list, &ksm_mm_head.mm_list);
-	else
-		list_add_tail(&mm_slot->mm_list, &ksm_scan.mm_slot->mm_list);
+	list_add_tail(&mm_slot->mm_list,
+		      ksm_run & KSM_RUN_UNMERGE
+		      ? &ksm_mm_head.mm_list
+		      : &ksm_scan.mm_slot->mm_list);
 	spin_unlock(&ksm_mmlist_lock);

 	set_bit(MMF_VM_MERGEABLE, &mm->flags);
--
2.22.0