linux-kernel - [PATCH v3 41/66] kernel/acct: Use maple tree iterators instead of linked list

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Message-ID: <20211005012959.1110504-42-Liam.Howlett@oracle.com>
Date:   Tue, 5 Oct 2021 01:31:01 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Douglas Gilbert <dgilbert@...erlog.com>
CC:     Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rik van Riel <riel@...riel.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH v3 41/66] kernel/acct: Use maple tree iterators instead of
 linked list

From: "Liam R. Howlett" <Liam.Howlett@...cle.com>

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 kernel/acct.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/acct.c b/kernel/acct.c
index 23a7ab8e6cbc..32343edc7330 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -534,16 +534,16 @@ void acct_collect(long exitcode, int group_dead)
 	struct pacct_struct *pacct = &current->signal->pacct;
 	u64 utime, stime;
 	unsigned long vsize = 0;
+	MA_STATE(mas, &current->mm->mm_mt, 0, 0);
 
 	if (group_dead && current->mm) {
 		struct vm_area_struct *vma;
 
 		mmap_read_lock(current->mm);
-		vma = current->mm->mmap;
-		while (vma) {
+		rcu_read_lock();
+		mas_for_each(&mas, vma, ULONG_MAX)
 			vsize += vma->vm_end - vma->vm_start;
-			vma = vma->vm_next;
-		}
+		rcu_read_unlock();
 		mmap_read_unlock(current->mm);
 	}
 
-- 
2.30.2