Re: ./include/generated/autoconf.h:1601:33: fatal error: mach/debug-macro.S: No such file or directory

[Alexandre Belloni]

On 11/11/2020 09:51:26+0100, Linus Walleij wrote:
> On Wed, Nov 11, 2020 at 7:18 AM kernel test robot <lkp@xxxxxxxxx> wrote:
> 
> >    In file included from include/linux/kconfig.h:7,
> >                     from <command-line>:
> > >> ./include/generated/autoconf.h:1601:33: fatal error: mach/debug-macro.S: No such file or directory
> >     1601 | #define CONFIG_DEBUG_LL_INCLUDE "mach/debug-macro.S"
> >          |                                 ^~~~~~~~~~~~~~~~~~~~
> >    compilation terminated.
> 
> This is an interesting one!
> 
> It happens when CONFIG_DEBUG_LL_INCLUDE does not have a custom
> debug header for the platform under arch/arm/include/debug and the
> KConfig falls through to the default value, which is <mach/debug-macro.S>.
> 
> Only that the majority is not using <mach/*> anymore.
> 
> I feel a bit like setting the default to debug/8250.S or something.
> 
> Suggestions?
> 
> Then the actual bug exposed:
> 
> The config tested by the robot is using
> CONFIG_ARCH_AT91=y
> CONFIG_SOC_SAMV7=y
> 
> When I look into Kconfig.debug it seems that this will define
> DEBUG_AT91_SAMV7_USART1 but only a physical address,
> no virtual address and and actually no debug header. It seems
> LL_DEBUG is broken on SAMV7 and never really worked
> so now that crops up.
> 
> Nicolas, something that should be fixed, I think?
> 

This is what the platforms without an MMU are doing. I don't think there
is anything platform specific to fix.