linux-kernel - Re: [PATCH] drivers/usb/gadget/udc/r8a66597-udc.c: Deinline pipe

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Date:	Mon, 11 Apr 2016 08:21:15 +0300
From:	Felipe Balbi <felipe.balbi@...ux.intel.com>
To:	Denys Vlasenko <dvlasenk@...hat.com>, Felipe Balbi <balbi@...com>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/usb/gadget/udc/r8a66597-udc.c: Deinline pipe_change, save 2176 bytes


Hi,

Denys Vlasenko <dvlasenk@...hat.com> writes:
> This function compiles to 298 bytes of machine code, has ~10 callsites.

fair enough

> This is a USB 2.0 device, USB 2.0 is limited to 35 MB/s, so should be

it's not limited to 35MB/sec, sorry. USB 2.0 has a theoretical maximum
of 60MB/sec. But 44MB/sec is what people consider 'possible'. I've
gotten to 41MB/sec with g_mas_storage gadget.

> almost never CPU bound.
>
> No need to optimize for speed this agressively.
>
> Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
> CC: Felipe Balbi <balbi@...com>
> CC: linux-usb@...r.kernel.org
> CC: linux-kernel@...r.kernel.org
> ---
>  drivers/usb/gadget/udc/r8a66597-udc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/gadget/udc/r8a66597-udc.c b/drivers/usb/gadget/udc/r8a66597-udc.c
> index baa0609..1d79a47 100644
> --- a/drivers/usb/gadget/udc/r8a66597-udc.c
> +++ b/drivers/usb/gadget/udc/r8a66597-udc.c
> @@ -296,7 +296,7 @@ static void r8a66597_change_curpipe(struct r8a66597 *r8a66597, u16 pipenum,
>  	} while ((tmp & mask) != loop);
>  }
>  
> -static inline void pipe_change(struct r8a66597 *r8a66597, u16 pipenum)
> +static void pipe_change(struct r8a66597 *r8a66597, u16 pipenum)
>  {
>  	struct r8a66597_ep *ep = r8a66597->pipenum2ep[pipenum];
>  
> -- 
> 2.1.0
>
> --
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-- 
balbi

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