linux-kernel - Re: [PATCH 0/7] serial: Finish kgdb on qcom

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Message-ID: <20181030115628.eqtyqdugkpkxvyr2@holly.lan>
Date:   Tue, 30 Oct 2018 11:56:28 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Jason Wessel <jason.wessel@...driver.com>, tglx@...utronix.de,
        mingo@...nel.org, gregkh@...uxfoundation.org,
        linux-arm-msm@...r.kernel.org,
        kgdb-bugreport@...ts.sourceforge.net, nm@...com,
        linux-mips@...ux-mips.org, dalias@...c.org,
        catalin.marinas@....com, vigneshr@...com,
        linux-aspeed@...ts.ozlabs.org, linux-sh@...r.kernel.org,
        peterz@...radead.org, will.deacon@....com, mhocko@...e.com,
        paulus@...ba.org, hpa@...or.com, sparclinux@...r.kernel.org,
        marex@...x.de, sfr@...b.auug.org.au, ysato@...rs.sourceforge.jp,
        linux-hexagon@...r.kernel.org, x86@...nel.org,
        linux@...linux.org.uk, pombredanne@...b.com, tony@...mide.com,
        mingo@...hat.com, joel@....id.au, linux-serial@...r.kernel.org,
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        mpe@...erman.id.au, akpm@...ux-foundation.org,
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        kstewart@...uxfoundation.org
Subject: Re: [PATCH 0/7] serial: Finish kgdb on qcom_geni; fix many lockdep
 splats w/ kgdb

On Mon, Oct 29, 2018 at 11:07:00AM -0700, Douglas Anderson wrote:
> Looking back, this is pretty much two series squashed that could be
> treated indepdently.  The first is a serial series and the second is a
> kgdb series.

Indeed.

I couldn't work out the link between the first 5 patches and the last 2
until I read this...

Is anything in the 01->05 patch set even related to kgdb? From the stack
traces it looks to me like the lock dep warning would trigger for any
sysrq. I think separating into two threads for v2 would be sensible.


Daniel.


> 
> For all serial patches I'd expect them to go through the tty tree once
> they've been reviewed.
> 
> If folks are OK w/ the 'smp' patch it probably should go in some core
> kernel tree.  The kgdb patch won't work without it, though, so to land
> that we'd need coordination between the folks landing that and the
> folks landing the 'smp' patch.
> 
> 
> Douglas Anderson (7):
>   serial: qcom_geni_serial: Finish supporting sysrq
>   serial: core: Allow processing sysrq at port unlock time
>   serial: qcom_geni_serial: Process sysrq at port unlock time
>   serial: core: Include console.h from serial_core.h
>   serial: 8250: Process sysrq at port unlock time
>   smp: Don't yell about IRQs disabled in kgdb_roundup_cpus()
>   kgdb: Remove irq flags and local_irq_enable/disable from roundup
> 
>  arch/arc/kernel/kgdb.c                      |  4 +--
>  arch/arm/kernel/kgdb.c                      |  4 +--
>  arch/arm64/kernel/kgdb.c                    |  4 +--
>  arch/hexagon/kernel/kgdb.c                  | 11 ++----
>  arch/mips/kernel/kgdb.c                     |  4 +--
>  arch/powerpc/kernel/kgdb.c                  |  2 +-
>  arch/sh/kernel/kgdb.c                       |  4 +--
>  arch/sparc/kernel/smp_64.c                  |  2 +-
>  arch/x86/kernel/kgdb.c                      |  9 ++---
>  drivers/tty/serial/8250/8250_aspeed_vuart.c |  6 +++-
>  drivers/tty/serial/8250/8250_fsl.c          |  6 +++-
>  drivers/tty/serial/8250/8250_omap.c         |  6 +++-
>  drivers/tty/serial/8250/8250_port.c         |  8 ++---
>  drivers/tty/serial/qcom_geni_serial.c       | 10 ++++--
>  include/linux/kgdb.h                        |  9 ++---
>  include/linux/serial_core.h                 | 38 ++++++++++++++++++++-
>  kernel/debug/debug_core.c                   |  2 +-
>  kernel/smp.c                                |  4 ++-
>  18 files changed, 80 insertions(+), 53 deletions(-)
> 
> -- 
> 2.19.1.568.g152ad8e336-goog
>