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Date: Tue, 5 Oct 2021 01:30:49 +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 31/66] arch/xtensa: Use maple tree iterators for unmapped area From: "Liam R. Howlett" <Liam.Howlett@...cle.com> Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com> --- arch/xtensa/kernel/syscall.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/xtensa/kernel/syscall.c b/arch/xtensa/kernel/syscall.c index 201356faa7e6..118fe0ca7594 100644 --- a/arch/xtensa/kernel/syscall.c +++ b/arch/xtensa/kernel/syscall.c @@ -58,6 +58,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { struct vm_area_struct *vmm; + MA_STATE(mas, &mm->mm_mt, addr, addr); if (flags & MAP_FIXED) { /* We do not accept a shared mapping if it would violate @@ -79,7 +80,8 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, else addr = PAGE_ALIGN(addr); - for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { + /* Must hold mm_mt lock */ + mas_for_each(&mas, vmm, ULONG_MAX) { /* At this point: (!vmm || addr < vmm->vm_end). */ if (TASK_SIZE - len < addr) return -ENOMEM; -- 2.30.2
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