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

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Message-ID: <20201113235801.GB6117@piout.net>
Date:   Sat, 14 Nov 2020 00:58:01 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     kernel test robot <lkp@...el.com>, Arnd Bergmann <arnd@...db.de>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Olof Johansson <olof@...om.net>, kbuild-all@...ts.01.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>
Subject: Re: ./include/generated/autoconf.h:1601:33: fatal error:
 mach/debug-macro.S: No such file or directory

On 11/11/2020 09:51:26+0100, Linus Walleij wrote:
> On Wed, Nov 11, 2020 at 7:18 AM kernel test robot <lkp@...el.com> 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?
> 

I confirm DEBUG_LL is not broken on SAMV7. The config used by lkp doen't
define DEBUG_AT91_SAMV7_USART1, it is not the culprit. Select it and the
problem is gone since DEBUG_AT91_SAMV7_USART1 selects DEBUG_AT91_UART
and DEBUG_LL_INCLUDE has:
default "debug/at91.S" if DEBUG_AT91_UART

Your issue is CONFIG_DEBUG_SEMIHOSTING