linux-kernel - [PATCH v3 27/66] arch/powerpc: Remove mmap linked list from mm/book3s32/tlb

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Date:   Tue, 5 Oct 2021 01:30:47 +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 27/66] arch/powerpc: Remove mmap linked list from
 mm/book3s32/tlb

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

Start using the maple tree

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 arch/powerpc/mm/book3s32/tlb.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/book3s32/tlb.c b/arch/powerpc/mm/book3s32/tlb.c
index 19f0ef950d77..2c8b991de8e8 100644
--- a/arch/powerpc/mm/book3s32/tlb.c
+++ b/arch/powerpc/mm/book3s32/tlb.c
@@ -81,6 +81,7 @@ EXPORT_SYMBOL(hash__flush_range);
 void hash__flush_tlb_mm(struct mm_struct *mm)
 {
 	struct vm_area_struct *mp;
+	MA_STATE(mas, &mm->mm_mt, 0, 0);
 
 	/*
 	 * It is safe to go down the mm's list of vmas when called
@@ -88,8 +89,10 @@ void hash__flush_tlb_mm(struct mm_struct *mm)
 	 * unmap_region or exit_mmap, but not from vmtruncate on SMP -
 	 * but it seems dup_mmap is the only SMP case which gets here.
 	 */
-	for (mp = mm->mmap; mp != NULL; mp = mp->vm_next)
+	rcu_read_lock();
+	mas_for_each(&mas, mp, ULONG_MAX)
 		hash__flush_range(mp->vm_mm, mp->vm_start, mp->vm_end);
+	rcu_read_unlock();
 }
 EXPORT_SYMBOL(hash__flush_tlb_mm);
 
-- 
2.30.2