From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrea Arcangeli Subject: [PATCH 05/21] userfaultfd: add vm_userfaultfd_ctx to the vm_area_struct Date: Thu, 5 Mar 2015 18:17:48 +0100 Message-ID: <1425575884-2574-6-git-send-email-aarcange@redhat.com> References: <1425575884-2574-1-git-send-email-aarcange@redhat.com> Return-path: In-Reply-To: <1425575884-2574-1-git-send-email-aarcange@redhat.com> Sender: owner-linux-mm@kvack.org To: qemu-devel@nongnu.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, Android Kernel Team Cc: "Kirill A. Shutemov" , Pavel Emelyanov , Sanidhya Kashyap , zhang.zhanghailiang@huawei.com, Linus Torvalds , Andres Lagar-Cavilla , Dave Hansen , Paolo Bonzini , Rik van Riel , Mel Gorman , Andy Lutomirski , Andrew Morton , Sasha Levin , Hugh Dickins , Peter Feiner , "Dr. David Alan Gilbert" , Christopher Covington , Johannes Weiner , Robert Love , Dmitry Adamushko List-Id: linux-api@vger.kernel.org This adds the vm_userfaultfd_ctx to the vm_area_struct. Signed-off-by: Andrea Arcangeli --- include/linux/mm_types.h | 11 +++++++++++ kernel/fork.c | 1 + 2 files changed, 12 insertions(+) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 199a03a..fbf21f5 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -247,6 +247,16 @@ struct vm_region { * this region */ }; +#ifdef CONFIG_USERFAULTFD +#define NULL_VM_UFFD_CTX ((struct vm_userfaultfd_ctx) { NULL, }) +struct vm_userfaultfd_ctx { + struct userfaultfd_ctx *ctx; +}; +#else /* CONFIG_USERFAULTFD */ +#define NULL_VM_UFFD_CTX ((struct vm_userfaultfd_ctx) {}) +struct vm_userfaultfd_ctx {}; +#endif /* CONFIG_USERFAULTFD */ + /* * This struct defines a memory VMM memory area. There is one of these * per VM-area/task. A VM area is any part of the process virtual memory @@ -313,6 +323,7 @@ struct vm_area_struct { #ifdef CONFIG_NUMA struct mempolicy *vm_policy; /* NUMA policy for the VMA */ #endif + struct vm_userfaultfd_ctx vm_userfaultfd_ctx; }; struct core_thread { diff --git a/kernel/fork.c b/kernel/fork.c index cf65139..cb215c0 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -425,6 +425,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm) goto fail_nomem_anon_vma_fork; tmp->vm_flags &= ~VM_LOCKED; tmp->vm_next = tmp->vm_prev = NULL; + tmp->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX; file = tmp->vm_file; if (file) { struct inode *inode = file_inode(file); -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org