From: Cornelia Huck <cohuck@redhat.com>
To: Eric Farman <farman@linux.ibm.com>
Cc: Farhan Ali <alifm@linux.ibm.com>,
Halil Pasic <pasic@linux.ibm.com>,
linux-s390@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH v2 6/9] vfio-ccw: Adjust the first IDAW outside of the nested loops
Date: Thu, 13 Jun 2019 18:02:49 +0200 [thread overview]
Message-ID: <20190613180249.1f26258d.cohuck@redhat.com> (raw)
In-Reply-To: <20190606202831.44135-7-farman@linux.ibm.com>
On Thu, 6 Jun 2019 22:28:28 +0200
Eric Farman <farman@linux.ibm.com> wrote:
> Now that pfn_array_table[] is always an array of 1, it seems silly to
> check for the very first entry in an array in the middle of two nested
> loops, since we know it'll only ever happen once.
>
> Let's move this outside the loops to simplify things, even though
> the "k" variable is still necessary.
>
> Signed-off-by: Eric Farman <farman@linux.ibm.com>
> ---
> drivers/s390/cio/vfio_ccw_cp.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c
> index 86a0e76ef2b5..ab9f8f0d1b44 100644
> --- a/drivers/s390/cio/vfio_ccw_cp.c
> +++ b/drivers/s390/cio/vfio_ccw_cp.c
> @@ -201,11 +201,12 @@ static inline void pfn_array_table_idal_create_words(
> pa = pat->pat_pa + i;
> for (j = 0; j < pa->pa_nr; j++) {
> idaws[k] = pa->pa_pfn[j] << PAGE_SHIFT;
> - if (k == 0)
> - idaws[k] += pa->pa_iova & (PAGE_SIZE - 1);
> k++;
> }
> }
> +
> + /* Adjust the first IDAW, since it may not start on a page boundary */
> + idaws[0] += pat->pat_pa->pa_iova & (PAGE_SIZE - 1);
> }
>
>
Also +1 to adding a nice explaining comment :)
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
next prev parent reply other threads:[~2019-06-13 16:02 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-06 20:28 [PATCH v2 0/9] s390: vfio-ccw code rework Eric Farman
2019-06-06 20:28 ` [PATCH v2 1/9] s390/cio: Squash cp_free() and cp_unpin_free() Eric Farman
2019-06-12 11:07 ` Cornelia Huck
2019-06-06 20:28 ` [PATCH v2 2/9] s390/cio: Refactor the routine that handles TIC CCWs Eric Farman
2019-06-12 11:17 ` Cornelia Huck
2019-06-06 20:28 ` [PATCH v2 3/9] s390/cio: Generalize the TIC handler Eric Farman
2019-06-12 11:18 ` Cornelia Huck
2019-06-06 20:28 ` [PATCH v2 4/9] s390/cio: Use generalized CCW handler in cp_init() Eric Farman
2019-06-12 11:18 ` Cornelia Huck
2019-06-06 20:28 ` [PATCH v2 5/9] vfio-ccw: Rearrange pfn_array and pfn_array_table arrays Eric Farman
2019-06-13 16:02 ` Cornelia Huck
2019-06-06 20:28 ` [PATCH v2 6/9] vfio-ccw: Adjust the first IDAW outside of the nested loops Eric Farman
2019-06-13 16:02 ` Cornelia Huck [this message]
2019-06-06 20:28 ` [PATCH v2 7/9] vfio-ccw: Remove pfn_array_table Eric Farman
2019-06-13 16:03 ` Cornelia Huck
2019-06-06 20:28 ` [PATCH v2 8/9] vfio-ccw: Rearrange IDAL allocation in direct CCW Eric Farman
2019-06-14 9:42 ` Cornelia Huck
2019-06-06 20:28 ` [PATCH v2 9/9] s390/cio: Combine direct and indirect CCW paths Eric Farman
2019-06-14 10:01 ` Cornelia Huck
2019-06-14 10:30 ` Eric Farman
2019-06-14 10:03 ` [PATCH v2 0/9] s390: vfio-ccw code rework Cornelia Huck
2019-06-17 13:32 ` Cornelia Huck
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