linux-kernel - Re: [PATCH v3] kdb: Simplify kdb commands registration

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Date:   Tue, 9 Feb 2021 16:37:00 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     kgdb-bugreport@...ts.sourceforge.net,
        Jason Wessel <jason.wessel@...driver.com>,
        Douglas Anderson <dianders@...omium.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] kdb: Simplify kdb commands registration

On Mon, 8 Feb 2021 at 19:18, Daniel Thompson <daniel.thompson@...aro.org> wrote:
>
> On Mon, Feb 08, 2021 at 03:18:19PM +0530, Sumit Garg wrote:
> > On Mon, 8 Feb 2021 at 15:13, Daniel Thompson <daniel.thompson@...aro.org> wrote:
> > >
> > > On Fri, Jan 29, 2021 at 03:47:07PM +0530, Sumit Garg wrote:
> > > > @@ -1011,25 +1005,17 @@ int kdb_parse(const char *cmdstr)
> > > >               ++argv[0];
> > > >       }
> > > >
> > > > -     for_each_kdbcmd(tp, i) {
> > > > -             if (tp->cmd_name) {
> > > > -                     /*
> > > > -                      * If this command is allowed to be abbreviated,
> > > > -                      * check to see if this is it.
> > > > -                      */
> > > > -
> > > > -                     if (tp->cmd_minlen
> > > > -                      && (strlen(argv[0]) <= tp->cmd_minlen)) {
> > > > -                             if (strncmp(argv[0],
> > > > -                                         tp->cmd_name,
> > > > -                                         tp->cmd_minlen) == 0) {
> > > > -                                     break;
> > > > -                             }
> > > > -                     }
> > > > -
> > > > -                     if (strcmp(argv[0], tp->cmd_name) == 0)
> > > > +     list_for_each_entry(tp, &kdb_cmds_head, list_node) {
> > > > +             /*
> > > > +              * If this command is allowed to be abbreviated,
> > > > +              * check to see if this is it.
> > > > +              */
> > > > +             if (tp->cmd_minlen && (strlen(argv[0]) <= tp->cmd_minlen) &&
> > > > +                 (strncmp(argv[0], tp->cmd_name, tp->cmd_minlen) == 0))
> > > >                               break;
> > >
> > > Looks like you forgot to unindent this line.
> > >
> > > I will fix it up but... checkpatch would have found this.
> > >
> >
> > Ah, I missed to run checkpatch on v3. Thanks for fixing this up.
>
> Unfortunately, it's not just checkpatch. This patch also causes a
> large number of test suite regressions. In particular it looks like
> kgdbwait does not work with this patch applied.
>
> The problem occurs on multiple architectures all with
> close-to-defconfig kernels. However to share one specific
> failure, x86_64_defconfig plus the following is not bootable:
>
>     ../scripts/config --enable DEBUG_INFO --enable DEBUG_FS \
>       --enable KALLSYMS_ALL --enable MAGIC_SYSRQ --enable KGDB \
>       --enable KGDB_TESTS --enable KGDB_KDB --enable KDB_KEYBOARD \
>       --enable LKDTM
>
> Try:
>
>     qemu-system-x86_64 \
>       -enable-kvm -m 1G -smp 2 -nographic
>       -kernel arch/x86/boot/bzImage \
>       -append "console=ttyS0,115200 kgdboc=ttyS0 kgdbwait"
>

Thanks Daniel for this report. I am able to reproduce it with
"kgdbwait" and will investigate it.

-Sumit

>
> Daniel.