linux-kernel - [PATCH 24/29] mm: enable speculative fault handling through do_swap

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Message-Id: <20210430195232.30491-25-michel@lespinasse.org>
Date:   Fri, 30 Apr 2021 12:52:25 -0700
From:   Michel Lespinasse <michel@...pinasse.org>
To:     Linux-MM <linux-mm@...ck.org>,
        Linux-Kernel <linux-kernel@...r.kernel.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>,
        Andy Lutomirski <luto@...nel.org>,
        Michel Lespinasse <michel@...pinasse.org>
Subject: [PATCH 24/29] mm: enable speculative fault handling through do_swap_page()

Change do_swap_page() to allow speculative fault execution to proceed.

Signed-off-by: Michel Lespinasse <michel@...pinasse.org>
---
 mm/memory.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index a3708b4a616c..cf1a1c0196f0 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3357,11 +3357,6 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
 	vm_fault_t ret = 0;
 	void *shadow = NULL;
 
-	if (vmf->flags & FAULT_FLAG_SPECULATIVE) {
-		pte_unmap(vmf->pte);
-		return VM_FAULT_RETRY;
-	}
-
 #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPTION)
 	if (sizeof(pte_t) > sizeof(unsigned long)) {
 		/*
-- 
2.20.1