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Date: Tue, 12 Jan 2021 11:12:30 -0500 From: "Liam R. Howlett" <Liam.Howlett@...cle.com> To: maple-tree@...ts.infradead.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org Cc: Andrew Morton <akpm@...gle.com>, Song Liu <songliubraving@...com>, Davidlohr Bueso <dave@...olabs.net>, "Paul E . McKenney" <paulmck@...nel.org>, Matthew Wilcox <willy@...radead.org>, Jerome Glisse <jglisse@...hat.com>, 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 v2 60/70] mm/mprotect: Use maple tree navigation instead of vma linked list Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com> --- mm/mprotect.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/mm/mprotect.c b/mm/mprotect.c index 56c02beb60414..a6208b872336e 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -518,6 +518,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len, const int grows = prot & (PROT_GROWSDOWN|PROT_GROWSUP); const bool rier = (current->personality & READ_IMPLIES_EXEC) && (prot & PROT_READ); + MA_STATE(mas, ¤t->mm->mm_mt, start, start); start = untagged_addr(start); @@ -549,11 +550,12 @@ static int do_mprotect_pkey(unsigned long start, size_t len, if ((pkey != -1) && !mm_pkey_is_allocated(current->mm, pkey)) goto out; - vma = find_vma(current->mm, start); + mas_set(&mas, start); + vma = mas_walk(&mas); error = -ENOMEM; if (!vma) goto out; - prev = vma->vm_prev; + prev = mas_prev(&mas, 0); if (unlikely(grows & PROT_GROWSDOWN)) { if (vma->vm_start >= end) goto out; @@ -626,7 +628,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len, if (nstart >= end) goto out; - vma = prev->vm_next; + vma = mas_next(&mas, ULONG_MAX); if (!vma || vma->vm_start != nstart) { error = -ENOMEM; goto out; -- 2.28.0
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