Re: [PATCH] ARM: debug-ll: fix BCM63xx entry for multiplatform

[Arnd Bergmann]

On Monday 18 January 2016 09:41:17 Randy Dunlap wrote:
> On 01/18/16 01:51, Arnd Bergmann wrote:
> > During my randconfig build testing, I found that a kernel with
> > DEBUG_AT91_UART and ARCH_BCM_63XX fails to build:
> > 
> > arch/arm/include/debug/at91.S:18:0: error: "CONFIG_DEBUG_UART_VIRT" redefined [-Werror]
> > 
> > It turns out that the DEBUG_UART_BCM63XX option is enabled whenever
> > the ARCH_BCM_63XX is, and that breaks multiplatform kernels because
> > we then end up using the UART address from BCM63XX rather than the
> > one we actually configured (if any).
> > 
> > This changes the BCM63XX options to only have one Kconfig option,
> > and only enable that if the user explicitly turns it on.
> > 
> > Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> > Fixes: b51312bebfa4 ("ARM: BCM63XX: add low-level UART debug support")
> > Cc: stable@xxxxxxxxxxxxxxx
> > 
> > diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
> > index c57cbb7e8179..4a2c6a3bc90a 100644
> > --- a/arch/arm/Kconfig.debug
> > +++ b/arch/arm/Kconfig.debug
> > @@ -153,10 +153,10 @@ choice
> >                 mobile SoCs in the Kona family of chips (e.g. bcm28155,
> >                 bcm11351, etc...)
> >  
> > -     config DEBUG_BCM63XX
> > +     config DEBUG_BCM63XX_UART
> >               bool "Kernel low-level debugging on BCM63XX UART"
> >               depends on ARCH_BCM_63XX
> > -             select DEBUG_UART_BCM63XX
> > +             help              
> 
> What's with the empty help message (and lots of trailing whitespace)?
> 
> 

Sorry about that. I was planning to add some text at first and then
saw that most others didn't have one either in this list, so I dropped
it again.

Curiously, the empty help text actually caused some serious problems
later on in my build testing, so this patch creates a regression unless
I remove that line again (as I should anyway).

Thanks for spotting this as well!

	Arnd