Re: [PATCH] usb: xhci: mark xhci_unmap_td_bounce_buffer() static

[Greg KH]

On Fri, Sep 23, 2016 at 09:46:13PM +0800, Baoyou Xie wrote:
> We get 1 warning when building kernel with W=1:
> drivers/usb/host/xhci-ring.c:608:6: warning: no previous prototype for 'xhci_unmap_td_bounce_buffer' [-Wmissing-prototypes]
> 
> In fact, this function is only used in the file in which it is
> declared and don't need a declaration, but can be made static.
> so this patch marks this function with 'static'.

Any reason you aren't using sparse for all of these 'static' functions
you are finding?  It should be easier than using 'W=1'.

thanks,

greg k-h