On Mon, Jul 27, 2015 at 04:29:38PM -0700, Yinghai Lu wrote:
> If the bridge does not support hotplug or no child with sriov support
> we could get out early and don't try must+optional allocation.
You mention non-hotplug bridges and non-SR-IOV devices, but I can't figure
out how the patch itself relates to those. How can I connect them?
> Also in the loop that update res with optional add info, skip resource
> that add_size is 0.
>
> Signed-off-by: Yinghai Lu <ying...@kernel.org>
> ---
> drivers/pci/setup-bus.c | 32 +++++++++++++++++++++++++++++---
> 1 file changed, 29 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> index d1f9e19..64ef516 100644
> --- a/drivers/pci/setup-bus.c
> +++ b/drivers/pci/setup-bus.c
> @@ -450,6 +450,24 @@ static bool pci_need_to_release(unsigned long mask,
> struct resource *res)
> return false; /* should not get here */
> }
>
> +static bool __has_addon(struct list_head *head,
> + struct list_head *realloc_head)
Why does this have a "__" prefix?
> +{
> + int add_count = 0;
> + struct pci_dev_resource *dev_res, *tmp_res;
> +
> + /* check if we have add really */
> + list_for_each_entry(dev_res, head, list) {
> + tmp_res = res_to_dev_res(realloc_head, dev_res->res);
> + if (!tmp_res || !tmp_res->add_size)
> + continue;
> +
> + add_count++;
> + }
> +
> + return add_count != 0;
> +}
> +
> static bool save_resources(struct list_head *head,
> struct list_head *save_head)
> {
> @@ -481,16 +499,24 @@ static bool __assign_resources_must_add_sorted(struct
> list_head *head,
> struct pci_dev_resource *save_res;
> struct pci_dev_resource *dev_res, *tmp_res;
> unsigned long fail_type;
> - resource_size_t add_align;
> + resource_size_t add_align, add_size;
> struct resource *res;
>
> + if (!__has_addon(head, realloc_head))
> + return false;
> +
> if (!save_resources(head, &save_head))
> return false;
>
> /* Update res in head list with add_size in realloc_head list */
> list_for_each_entry(dev_res, head, list) {
> res = dev_res->res;
> - res->end += get_res_add_size(realloc_head, res);
> + add_size = get_res_add_size(realloc_head, res);
> +
> + if (!add_size)
> + continue;
> +
> + res->end += add_size;
>
> /*
> * There are two kinds of additional resources in the list:
> @@ -578,7 +604,7 @@ static void __assign_resources_sorted(struct list_head
> *head,
> */
>
> /* Check must+optional add */
> - if (realloc_head && !list_empty(realloc_head) &&
> + if (realloc_head &&
Why are you dropping the !list_empty() test?
> __assign_resources_must_add_sorted(head, realloc_head))
> return;
>
> --
> 1.8.4.5
>
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