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From:   Liam Howlett <liam.howlett@oracle.com>
To:     "maple-tree@lists.infradead.org" <maple-tree@lists.infradead.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
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CC:     Song Liu <songliubraving@fb.com>,
        Davidlohr Bueso <dave@stgolabs.net>,
        "Paul E . McKenney" <paulmck@kernel.org>,
        Matthew Wilcox <willy@infradead.org>,
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        Rik van Riel <riel@surriel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Michel Lespinasse <walken.cr@gmail.com>,
        Liam Howlett <liam.howlett@oracle.com>
Subject: [PATCH 54/94] arch/parisc: Remove mmap linked list from kernel/cache
Thread-Topic: [PATCH 54/94] arch/parisc: Remove mmap linked list from
 kernel/cache
Thread-Index: AQHXPEQ5kJgl2G0NBUKuLENhUljoww==
Date:   Wed, 28 Apr 2021 15:36:15 +0000
Message-ID: <20210428153542.2814175-55-Liam.Howlett@Oracle.com>
References: <20210428153542.2814175-1-Liam.Howlett@Oracle.com>
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Start using the maple tree

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---
 arch/parisc/kernel/cache.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index 86a1a63563fd..bc7bffed24ba 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -520,9 +520,13 @@ static inline unsigned long mm_total_size(struct mm_st=
ruct *mm)
 {
 	struct vm_area_struct *vma;
 	unsigned long usize =3D 0;
+	MA_STATE(mas, &mm->mm_mt, 0, 0);
=20
-	for (vma =3D mm->mmap; vma; vma =3D vma->vm_next)
+	rcu_read_lock();
+	mas_for_each(&mas, vma, ULONG_MAX)
 		usize +=3D vma->vm_end - vma->vm_start;
+	rcu_read_unlock();
+
 	return usize;
 }
=20
@@ -548,6 +552,7 @@ void flush_cache_mm(struct mm_struct *mm)
 {
 	struct vm_area_struct *vma;
 	pgd_t *pgd;
+	MA_STATE(mas, &mm->mm_mt, 0, 0);
=20
 	/* Flushing the whole cache on each cpu takes forever on
 	   rp3440, etc.  So, avoid it if the mm isn't too big.  */
@@ -560,17 +565,20 @@ void flush_cache_mm(struct mm_struct *mm)
 	}
=20
 	if (mm->context =3D=3D mfsp(3)) {
-		for (vma =3D mm->mmap; vma; vma =3D vma->vm_next) {
+		rcu_read_lock();
+		mas_for_each(&mas, vma, ULONG_MAX) {
 			flush_user_dcache_range_asm(vma->vm_start, vma->vm_end);
 			if (vma->vm_flags & VM_EXEC)
 				flush_user_icache_range_asm(vma->vm_start, vma->vm_end);
 			flush_tlb_range(vma, vma->vm_start, vma->vm_end);
 		}
+		rcu_read_unlock();
 		return;
 	}
=20
 	pgd =3D mm->pgd;
-	for (vma =3D mm->mmap; vma; vma =3D vma->vm_next) {
+	rcu_read_lock();
+	mas_for_each(&mas, vma, ULONG_MAX) {
 		unsigned long addr;
=20
 		for (addr =3D vma->vm_start; addr < vma->vm_end;
@@ -590,6 +598,7 @@ void flush_cache_mm(struct mm_struct *mm)
 			}
 		}
 	}
+	rcu_read_unlock();
 }
=20
 void flush_cache_range(struct vm_area_struct *vma,
--=20
2.30.2