Hi,
rentao.bupt@xxxxxxxxx writes:
> From: Tao Ren <rentao.bupt@xxxxxxxxx>
>
> This is a follow-on patch for commit a23be4ed8f48 ("usb: gadget: aspeed:
> improve vhub port irq handling"): for_each_set_bit() is replaced with
> simple for() loop because for() loop runs faster on ASPEED BMC.
>
> Signed-off-by: Tao Ren <rentao.bupt@xxxxxxxxx>
> ---
> drivers/usb/gadget/udc/aspeed-vhub/core.c | 10 +++-------
> drivers/usb/gadget/udc/aspeed-vhub/vhub.h | 3 +++
> 2 files changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/core.c b/drivers/usb/gadget/udc/aspeed-vhub/core.c
> index cdf96911e4b1..be7bb64e3594 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/core.c
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/core.c
> @@ -135,13 +135,9 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
>
> /* Handle device interrupts */
> if (istat & vhub->port_irq_mask) {
> - unsigned long bitmap = istat;
> - int offset = VHUB_IRQ_DEV1_BIT;
> - int size = VHUB_IRQ_DEV1_BIT + vhub->max_ports;
> -
> - for_each_set_bit_from(offset, &bitmap, size) {
> - i = offset - VHUB_IRQ_DEV1_BIT;
> - ast_vhub_dev_irq(&vhub->ports[i].dev);
> + for (i = 0; i < vhub->max_ports; i++) {
> + if (istat & VHUB_DEV_IRQ(i))
> + ast_vhub_dev_irq(&vhub->ports[i].dev);
how have you measured your statement above? for_each_set_bit() does
exactly what you did. Unless your architecture has an instruction which
helps finds the next set bit (like cls on ARM), which, then, makes it
much faster.
--
balbi
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