Message ID | 20190926093904.5090-3-peterx@redhat.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
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Thu, 26 Sep 2019 02:39:34 -0700 (PDT) X-Google-Smtp-Source: APXvYqygg2Fz4n5y2GLmYVjuAatu7ERh1+nfGR8vHRiW6krMcMD+JGfGkv1cX87Z1ZdlzHDovLsjPg== X-Received: by 2002:a63:5807:: with SMTP id m7mr2441382pgb.371.1569490774350; Thu, 26 Sep 2019 02:39:34 -0700 (PDT) Received: from xz-x1.redhat.com ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id p68sm3224982pfp.9.2019.09.26.02.39.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Sep 2019 02:39:33 -0700 (PDT) From: Peter Xu <peterx@redhat.com> To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: David Hildenbrand <david@redhat.com>, Hugh Dickins <hughd@google.com>, Maya Gokhale <gokhale2@llnl.gov>, Jerome Glisse <jglisse@redhat.com>, Pavel Emelyanov <xemul@virtuozzo.com>, Johannes Weiner <hannes@cmpxchg.org>, peterx@redhat.com, Martin Cracauer <cracauer@cons.org>, Matthew Wilcox <willy@infradead.org>, Shaohua Li <shli@fb.com>, Marty McFadden <mcfadden8@llnl.gov>, Andrea Arcangeli <aarcange@redhat.com>, Mike Kravetz <mike.kravetz@oracle.com>, Denis Plotnikov <dplotnikov@virtuozzo.com>, Mike Rapoport <rppt@linux.vnet.ibm.com>, Linus Torvalds <torvalds@linux-foundation.org>, Mel Gorman <mgorman@suse.de>, "Kirill A . Shutemov" <kirill@shutemov.name>, "Dr . David Alan Gilbert" <dgilbert@redhat.com> Subject: [PATCH v5 02/16] mm/gup: Fix __get_user_pages() on fault retry of hugetlb Date: Thu, 26 Sep 2019 17:38:50 +0800 Message-Id: <20190926093904.5090-3-peterx@redhat.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190926093904.5090-1-peterx@redhat.com> References: <20190926093904.5090-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: <linux-mm.kvack.org> |
Series |
mm: Page fault enhancements
|
expand
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diff --git a/mm/gup.c b/mm/gup.c index eddbb95dcb8f..e60d32f1674d 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -833,6 +833,16 @@ static long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, i = follow_hugetlb_page(mm, vma, pages, vmas, &start, &nr_pages, i, gup_flags, locked); + if (locked && *locked == 0) { + /* + * We've got a VM_FAULT_RETRY + * and we've lost mmap_sem. + * We must stop here. + */ + BUG_ON(gup_flags & FOLL_NOWAIT); + BUG_ON(ret != 0); + goto out; + } continue; } }
When follow_hugetlb_page() returns with *locked==0, it means we've got a VM_FAULT_RETRY within the fauling process and we've released the mmap_sem. When that happens, we should stop and bail out. Signed-off-by: Peter Xu <peterx@redhat.com> --- mm/gup.c | 10 ++++++++++ 1 file changed, 10 insertions(+)