Re: Fwd: build issue #4 for v3.4-rc2-23-g923e9a1 :hub.c:(.text+0x51165d): undefined reference to `usb_speed_string'

[Greg KH <greg@xxxxxxxxx>]

On Wed, Apr 11, 2012 at 01:51:10PM -0700, Sarah Sharp wrote:
> Hi Greg,
> 
> Someone reported a USB build error to me, but I don't think it's from
> any patch I wrote.  It's against Linus' latest tree.
> 
> It looks like the linker warning references the usb_speed_string() line
> that was introduced by this commit:
> 
> commit e538dfdae85244fd2c4231725d82cc1f1bc4942c
> Author: Michal Nazarewicz <mina86@xxxxxxxxxx>
> Date:   Tue Aug 30 17:11:19 2011 +0200
> 
>     usb: Provide usb_speed_string() function
>     
>     In a few places in the kernel, the code prints
>     a human-readable USB device speed (eg. "high speed").
>     This involves a switch statement sometimes wrapped
>     around in ({ ... }) block leading to code repetition.
>     
>     To mitigate this issue, this commit introduces
>     usb_speed_string() function, which returns
>     a human-readable name of provided speed.
>     
>     It also changes a few places switch was used to use
>     this new function.  This changes a bit the way the
>     speed is printed in few instances at the same time
>     standardising it.
>     
>     Signed-off-by: Michal Nazarewicz <mina86@xxxxxxxxxx>
>     Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
> 
> But that's a pretty old commit, so I'm not sure why it's showing up now.
> Michal, do you know why this linker failure would happen?
> 
> All the info I have is attached, including the .config file I used to
> confirm the build failure.

It looks like somehow CONFIG_USB_SUPPORT is disabled, which might be the
issue here.

I don't really care about 'randconfig' errors like this, unless they
come with a patch, as the odds of hitting them by a "real" user are
almost impossible.

thanks,

greg k-h
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