linux-kernel - Re: Kconfig circular dependency question

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Date:	Sun, 06 Apr 2014 22:21:17 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Kconfig circular dependency question

On Sun, 2014-04-06 at 22:10 +0200, Paul Bolle wrote:
> On Sun, 2014-04-06 at 14:49 -0500, Larry Finger wrote:
> > A kernel build is reporting the following:
> > 
> > net/rfkill/Kconfig:4:error: recursive dependency detected!
> > net/rfkill/Kconfig:4:   symbol RFKILL is selected by R8723AU
> > drivers/staging/rtl8723au/Kconfig:1:    symbol R8723AU depends on USB
> > drivers/usb/Kconfig:41: symbol USB is selected by MOUSE_APPLETOUCH
> > drivers/input/mouse/Kconfig:162:        symbol MOUSE_APPLETOUCH depends on INPUT
> > drivers/input/Kconfig:8:        symbol INPUT is selected by ACPI_CMPC
> > drivers/platform/x86/Kconfig:635:       symbol ACPI_CMPC depends on RFKILL
> 
> I must be having a slow day, but how should this be parsed to see the
> recursive dependency?

So it tells us ("depends on" vertical, "is selected by" horizontal):

                                  R8723AU -> RFKILL
                                   |
                                   v
              MOUSE_APPLETOUCH -> USB
                |
                v
ACPCI_CMPC -> INPUT
  |
  v
RFKILL

doesn't it? And why is that a problem?


Paul Bolle

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