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Date: Tue, 6 Apr 2021 18:44:42 -0700 From: Michel Lespinasse <michel@...pinasse.org> To: Linux-MM <linux-mm@...ck.org> Cc: Laurent Dufour <ldufour@...ux.ibm.com>, Peter Zijlstra <peterz@...radead.org>, Michal Hocko <mhocko@...e.com>, Matthew Wilcox <willy@...radead.org>, Rik van Riel <riel@...riel.com>, Paul McKenney <paulmck@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Suren Baghdasaryan <surenb@...gle.com>, Joel Fernandes <joelaf@...gle.com>, Rom Lemarchand <romlem@...gle.com>, Linux-Kernel <linux-kernel@...r.kernel.org>, Michel Lespinasse <michel@...pinasse.org> Subject: [RFC PATCH 17/37] mm: implement speculative handling in do_numa_page() change do_numa_page() to use pte_spinlock() when locking the page table, so that the mmap sequence counter will be validated in the speculative case. Signed-off-by: Michel Lespinasse <michel@...pinasse.org> --- mm/memory.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index a2c5bf29f989..78cc36749754 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4181,8 +4181,8 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) * validation through pte_unmap_same(). It's of NUMA type but * the pfn may be screwed if the read is non atomic. */ - vmf->ptl = pte_lockptr(vma->vm_mm, vmf->pmd); - spin_lock(vmf->ptl); + if (!pte_spinlock(vmf)) + return VM_FAULT_RETRY; if (unlikely(!pte_same(*vmf->pte, vmf->orig_pte))) { pte_unmap_unlock(vmf->pte, vmf->ptl); goto out; -- 2.20.1
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