linux-kernel - Re: [PATCH 4/7] kgdboc: Add earlycon_kgdboc to support early kgdb using boot consoles

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Date:   Mon, 13 Apr 2020 14:59:59 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Daniel Thompson <daniel.thompson@...aro.org>,
        Jason Wessel <jason.wessel@...driver.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     kbuild-all@...ts.01.org, "H. Peter Anvin" <hpa@...or.com>,
        kgdb-bugreport@...ts.sourceforge.net,
        Jonathan Corbet <corbet@....net>,
        Frank Rowand <frowand.list@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>, bp@...en8.de,
        Catalin Marinas <catalin.marinas@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        kbuild test robot <lkp@...el.com>
Subject: Re: [PATCH 4/7] kgdboc: Add earlycon_kgdboc to support early kgdb
 using boot consoles

Hi,

On Fri, Apr 10, 2020 at 4:56 PM kbuild test robot <lkp@...el.com> wrote:
>
> Hi Douglas,
>
> I love your patch! Yet something to improve:
>
> [auto build test ERROR on arm64/for-next/core]
> [also build test ERROR on tty/tty-testing v5.6 next-20200410]
> [cannot apply to kgdb/kgdb-next]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system. BTW, we also suggest to use '--base' option to specify the
> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
>
> url:    https://github.com/0day-ci/linux/commits/Douglas-Anderson/kgdb-Support-late-serial-drivers-enable-early-debug-w-boot-consoles/20200411-062123
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
> config: microblaze-mmu_defconfig (attached as .config)
> compiler: microblaze-linux-gcc (GCC) 9.3.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         GCC_VERSION=9.3.0 make.cross ARCH=microblaze
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kbuild test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
>    drivers/misc/kgdbts.c: In function 'configure_kgdbts':
> >> drivers/misc/kgdbts.c:1080:8: error: too few arguments to function 'kgdb_register_io_module'
>     1080 |  err = kgdb_register_io_module(&kgdbts_io_ops);

Sigh, I knew I'd forget something stupid.  I have a fix for this and
have confirmed that "kgdbts" continues to work after I fix it.
Running it also found splats similar to what I fixed for "kgdboc" in
commit 81eaadcae81b ("kgdboc: disable the console lock when in kgdb").
I'll att a commit to my next version to move that fix into the kgdb
core and then remove it from "kgdboc".

I'm not setup to use kgdb over EHCI so I'll just fix that so it
compiles and trust that it continues to work.

For now I'll hold up on sending a new version to await feedback on v1.
If I don't hear anything after a little while I'll send a v2 with just
these fixes.

-Doug