linux-kernel - Re: [PATCH v4 00/12] kgdb: Support late serial drivers; enable early debug w/ boot consoles

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Date:   Tue, 19 May 2020 11:36:58 +0100
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     jason.wessel@...driver.com, gregkh@...uxfoundation.org,
        corbet@....net, frowand.list@...il.com, bjorn.andersson@...aro.org,
        linux-serial@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
        jslaby@...e.com, kgdb-bugreport@...ts.sourceforge.net,
        sumit.garg@...aro.org, will@...nel.org, tglx@...utronix.de,
        agross@...nel.org, catalin.marinas@....com, bp@...en8.de,
        Alexios Zavras <alexios.zavras@...el.com>,
        Allison Randal <allison@...utok.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Martin <Dave.Martin@....com>,
        Enrico Weigelt <info@...ux.net>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        James Morse <james.morse@....com>,
        Juergen Gross <jgross@...e.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Russell King <linux@...linux.org.uk>,
        jinho lim <jordan.lim@...sung.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v4 00/12] kgdb: Support late serial drivers; enable early
 debug w/ boot consoles

On Thu, May 07, 2020 at 01:08:38PM -0700, Douglas Anderson wrote:
> This whole pile of patches was motivated by me trying to get kgdb to
> work properly on a platform where my serial driver ended up being hit
> by the -EPROBE_DEFER virus (it wasn't practicing social distancing
> from other drivers).  Specifically my serial driver's parent device
> depended on a resource that wasn't available when its probe was first
> called.  It returned -EPROBE_DEFER which meant that when "kgdboc"
> tried to run its setup the serial driver wasn't there.  Unfortunately
> "kgdboc" never tried again, so that meant that kgdb was disabled until
> I manually enalbed it via sysfs.
> 
> <snip>
> 
> This series (and my comments / documentation / commit messages) are
> now long enough that my eyes glaze over when I try to read it all over
> to double-check.  I've nontheless tried to double-check it, but I'm
> pretty sure I did something stupid.  Thank you ahead of time for
> pointing it out to me so I can fix it in v5.  If somehow I managed to
> not do anything stupid (really?) then thank you for double-checking me
> anyway.

Applied (minus the arm64 specific stuff), should be in the next linux-next.


Daniel.