Re: [PATCH v2 2/5] vfio: ccw: shorten kernel doc description for pfn_array_pin()

Cornelia Huck
2018-04-23T11:44:19Z

On Mon, 23 Apr 2018 13:01:10 +0200
Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> wrote:

> The kernel doc description for usage of the struct pfn_array in
> pfn_array_pin() is unnecessary long. Let's shorten it by describing
> the contents of the struct pfn_array fields at the struct's definition
> instead.
>
> Suggested-by: Cornelia Huck <cohuck@redhat.com>
> Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
> ---
> drivers/s390/cio/vfio_ccw_cp.c | 14 ++++++--------
> 1 file changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c
> index 62d66e195304..e8fe7450702e 100644
> --- a/drivers/s390/cio/vfio_ccw_cp.c
> +++ b/drivers/s390/cio/vfio_ccw_cp.c
> @@ -23,9 +23,13 @@
> #define CCWCHAIN_LEN_MAX 256
>
> struct pfn_array {
> + /* Starting guest physical I/O address. */
> unsigned long pa_iova;
> + /* Array that stores PFNs of the pages need to pin. */

s/need to pin/needing to be pinned/ ? Or "we need to pin"? Or even
simply "to pin"?

(Pre-exiting, but we can as well fix it up. Can also do while applying.)

> unsigned long *pa_iova_pfn;
> + /* Array that receives PFNs of the pages pinned. */
> unsigned long *pa_pfn;
> + /* Number of pages to pin/pinned from @pa_iova. */
> int pa_nr;
> };
>
> @@ -53,14 +57,8 @@ struct ccwchain {
> * Attempt to pin user pages in memory.
> *
> * Usage of pfn_array:
> - * @pa->pa_iova starting guest physical I/O address. Assigned by caller.
> - * @pa->pa_iova_pfn array that stores PFNs of the pages need to pin. Allocated
> - * by caller.
> - * @pa->pa_pfn array that receives PFNs of the pages pinned. Allocated by
> - * caller.
> - * @pa->pa_nr number of pages from @pa->pa_iova to pin. Assigned by
> - * caller.
> - * number of pages pinned. Assigned by callee.
> + * Any field in this structure should be initialized by caller.
> + * We expect @pa->pa_nr > 0, and its value will be assigned by callee.
> *
> * Returns:
> * Number of pages pinned on success.

Otherwise, looks good.