lkml.org 
[lkml]   [2015]   [Mar]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 05/21] userfaultfd: add vm_userfaultfd_ctx to the vm_area_struct
    Date
    This adds the vm_userfaultfd_ctx to the vm_area_struct.

    Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
    ---
    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);

    \
     
     \ /
      Last update: 2015-03-05 18:41    [W:2.859 / U:0.144 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site