On Tue, Sep 27, 2016 at 06:08:13PM +0200, Jan Kara wrote:
> Introduce function finish_fault() as a helper function for finishing
> page faults. It is rather thin wrapper around alloc_set_pte() but since
> we'd want to call this from DAX code or filesystems, it is still useful
> to avoid some boilerplate code.
> 
> Signed-off-by: Jan Kara <j...@suse.cz>
> ---

> diff --git a/mm/memory.c b/mm/memory.c
> index 17db88a38e8a..f54cfad7fe04 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -3029,6 +3029,36 @@ int alloc_set_pte(struct vm_fault *vmf, struct 
> mem_cgroup *memcg,
>       return 0;
>  }
>  
> +
> +/**
> + * finish_fault - finish page fault once we have prepared the page to fault
> + *
> + * @vmf: structure describing the fault
> + *
> + * This function handles all that is needed to finish a page fault once the
> + * page to fault in is prepared. It handles locking of PTEs, inserts PTE for
> + * given page, adds reverse page mapping, handles memcg charges and LRU
> + * addition. The function returns 0 on success, VM_FAULT_ code in case of
> + * error.
> + *
> + * The function expects the page to be locked.
> + */
> +int finish_fault(struct vm_fault *vmf)
> +{
> +     struct page *page;
> +     int ret;
> +
> +     /* Did we COW the page? */
> +     if (vmf->flags & FAULT_FLAG_WRITE && !(vmf->vma->vm_flags & VM_SHARED))

Oh, sorry, I did have one bit of feedback.  Maybe added parens around the flag
check for readability:

        if ((vmf->flags & FAULT_FLAG_WRITE) && !(vmf->vma->vm_flags & 
VM_SHARED))

Aside from that one nit:

Reviewed-by: Ross Zwisler <ross.zwis...@linux.intel.com>

_______________________________________________
Linux-nvdimm mailing list
Linux-nvdimm@lists.01.org
https://lists.01.org/mailman/listinfo/linux-nvdimm

Reply via email to