linux-kernel - [PATCH v3 26/66] arch/parisc: Remove mmap linked list from kernel/cache

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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 26/66] arch/parisc: Remove mmap linked list from
 kernel/cache

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

Start using the maple tree

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.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 39e02227e231..f6316aafba10 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -519,9 +519,13 @@ static inline unsigned long mm_total_size(struct mm_struct *mm)
 {
 	struct vm_area_struct *vma;
 	unsigned long usize = 0;
+	MA_STATE(mas, &mm->mm_mt, 0, 0);
 
-	for (vma = mm->mmap; vma; vma = vma->vm_next)
+	rcu_read_lock();
+	mas_for_each(&mas, vma, ULONG_MAX)
 		usize += vma->vm_end - vma->vm_start;
+	rcu_read_unlock();
+
 	return usize;
 }
 
@@ -547,6 +551,7 @@ void flush_cache_mm(struct mm_struct *mm)
 {
 	struct vm_area_struct *vma;
 	pgd_t *pgd;
+	MA_STATE(mas, &mm->mm_mt, 0, 0);
 
 	/* Flushing the whole cache on each cpu takes forever on
 	   rp3440, etc.  So, avoid it if the mm isn't too big.  */
@@ -559,17 +564,20 @@ void flush_cache_mm(struct mm_struct *mm)
 	}
 
 	if (mm->context == mfsp(3)) {
-		for (vma = mm->mmap; vma; vma = 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;
 	}
 
 	pgd = mm->pgd;
-	for (vma = mm->mmap; vma; vma = vma->vm_next) {
+	rcu_read_lock();
+	mas_for_each(&mas, vma, ULONG_MAX) {
 		unsigned long addr;
 
 		for (addr = vma->vm_start; addr < vma->vm_end;
@@ -589,6 +597,7 @@ void flush_cache_mm(struct mm_struct *mm)
 			}
 		}
 	}
+	rcu_read_unlock();
 }
 
 void flush_cache_range(struct vm_area_struct *vma,
-- 
2.30.2