From: Paul Burton <paulburton@kernel.org>
To: Daniel Thompson <daniel.thompson@linaro.org>
Cc: "Douglas Anderson" <dianders@chromium.org>,
"Paul Burton" <paul.burton@mips.com>,
"Jason Wessel" <jason.wessel@windriver.com>,
qiaochong@loongson.cn, kgdb-bugreport@lists.sourceforge.net,
ralf@linux-mips.org,
"Sebastian Andrzej Siewior" <bigeasy@linutronix.de>,
"James Hogan" <jhogan@kernel.org>,
"Mike Rapoport" <rppt@linux.ibm.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org,
"Philippe Mathieu-Daudé" <f4bug@amsat.org>,
"Serge Semin" <fancer.lancer@gmail.com>,
"Andrew Morton" <akpm@linux-foundation.org>
Subject: Re: [PATCH 1/5] MIPS: kdb: Remove old workaround for backtracing on other CPUs
Date: Thu, 14 Nov 2019 16:30:51 -0800 [thread overview]
Message-ID: <20191115003051.blbbwr7hmuqyzjwb@lantea.localdomain> (raw)
In-Reply-To: <20191114105125.t3jma3ghwj2wtv6w@holly.lan>
Hi Daniel,
On Thu, Nov 14, 2019 at 10:51:25AM +0000, Daniel Thompson wrote:
> On Sat, Nov 09, 2019 at 11:16:40AM -0800, Douglas Anderson wrote:
> > As of commit 2277b492582d ("kdb: Fix stack crawling on 'running' CPUs
> > that aren't the master") we no longer need any special case for doing
> > stack dumps on CPUs that are not the kdb master. Let's remove.
> >
> > Signed-off-by: Douglas Anderson <dianders@chromium.org>
> > ---
> > I have no way to test this personally, so hopefully someone who uses
> > kdb/kgdb on MIPS can.
>
> I took this as a hint to add mips support to kgdbtest ;-)
Wonderful! :)
> Support is added and working well. Unfortunately lack of familiarity
> with mips means I have not yet figured out which mips defconfig gives
> us working SMP (and what the corresponding qemu invocation should be).
You can build 64r6el_defconfig & boot it something like this:
$ qemu-system-mips64el \
-M boston -cpu I6500 -smp 4 \
-kernel arch/mips/boot/vmlinux.gz.itb \
-serial stdio \
-hda my-disk-image.bin \
-append "root=/dev/sda"
Linux should see the system as a single core with 4 hardware threads
(VPs or Virtual Processors in MIPS terminology).
> > Ideally this patch should be Acked by MIPS folks and then land through
> > the kdb/kgdb tree since the next patch in the series, ("kdb:
> > kdb_current_regs should be private") depends on it.
>
> An Acked-by from a MIPS maintainer would be very welcome. Perhaps
> with a bit of extra work on the above I might be able to provide
> a Tested-by:.
The patches look reasonable to me; I was hoping to test them before
giving an ack but haven't had the time yet. It seems you may be making
that easier :)
Thanks,
Paul
next prev parent reply other threads:[~2019-11-15 0:30 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-09 19:16 [PATCH 0/5] kdb: Don't implicitly change tasks; plus misc fixups Douglas Anderson
2019-11-09 19:16 ` [PATCH 1/5] MIPS: kdb: Remove old workaround for backtracing on other CPUs Douglas Anderson
2019-11-14 10:51 ` Daniel Thompson
2019-11-14 16:10 ` Doug Anderson
2019-11-15 0:30 ` Paul Burton [this message]
2020-01-28 16:59 ` [PATCH 0/5] kdb: Don't implicitly change tasks; plus misc fixups Doug Anderson
2020-01-29 1:42 ` Andrew Morton
2020-01-29 15:23 ` Daniel Thompson
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